Dual-Panel Display Privacy via Voltage-Controlled Invisibility
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Solution Overview
Problem
Conventional double-sided display panels in cellular telephones lack security as the same signals are applied to both the main and sub-display panels, causing the sub-display panel to be visible when the main panel is in use, compromising privacy.
Innovation Solution
The sub-display panel is set to display a single color (all black or all white) by using liquid crystals with a different optimal driver voltage than the main panel, allowing the sub-panel to be effectively turned off when the main panel is in use, using a driver IC that supplies distinct driver signals to each panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same driver IC is used to drive both main and sub-display panels, then device complexity is reduced and cost is lowered, but security deteriorates because the sub-display panel becomes visible when the main panel is in use
Solution Approach 1:
The patent changes the voltage parameter of the driver signal to resolve the contradiction. By applying a specific voltage level to the sub-display panel, the liquid crystals are driven to a state where they block light transmission, rendering the sub-display invisible from the front while maintaining the ability to display information on the main panel. This parameter change allows a single driver IC to control both panels independently regarding visibility, thus maintaining security without increasing device complexity
Solution Approach 2:
The patent implements dynamic control of the sub-display panel's visibility state. The driver IC dynamically switches the sub-display panel between visible and invisible states based on the operational mode. When the main panel is in use, the sub-display is dynamically driven to an invisible state (all black or all white), and can be switched back to visible when needed, providing flexible security control without requiring multiple driver ICs
2Object-affected harmful factors
If separate driver ICs are used for main and sub-display panels, then security is improved by independently controlling each panel, but device complexity and cost increase
Solution Approach 1:
The patent makes a single driver IC universal by enabling it to perform multiple functions: driving the main display panel with its optimal voltage and driving the sub-display panel with a different voltage to control visibility. The driver IC is designed to output different voltage levels to different panels, allowing one component to replace what would traditionally require two separate components, thus reducing device complexity while maintaining security
3Ease of manufacture
If the sub-display panel uses the same liquid crystal properties as the main panel, then manufacturing is simplified, but the sub-display cannot be effectively turned off to maintain privacy
Solution Approach 1:
The patent applies local quality by selecting liquid crystals with different properties for the sub-display panel compared to the main panel. Specifically, liquid crystals with different optimal driver voltages are chosen for the sub-display, enabling it to respond differently to the same driver signals. This local differentiation in material properties allows the sub-display to be driven to an invisible state while the main panel remains visible, solving the privacy issue without complicating the overall manufacturing process
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 solution ensures the sub-display panel remains inactive when the main panel is active, maintaining privacy and reducing the need for additional driver ICs and components, thereby lowering costs and increasing design flexibility.
Implementation Method 1
liquid crystals having an optimal driver voltage that differs from the optimal driver voltage of the main display panel are used in the sub-display panel so that the sub-display panel becomes all black or all white when the main display panel is in use
Data Source
AI summary
A display device of the present invention switches between two displays, a main panel display and a sub-panel display, by using one driver IC. Liquid crystals having different optimal driver voltages are used in the main panel and the sub-panel, and the optimal driver voltage for the panel in which display is to be performed is output. A driver voltage that is higher or lower than the optimal driver voltage is applied to the display panel where display is not to be performed, and the entire display thereof displays a single color. Display content of the panel on which display is not to be performed cannot be identified.