Dual-Viewing-Angle Pixel Control for Smooth Privacy Mode Switching
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Solution Overview
Problem
Existing display devices struggle with smooth transitions between public and private viewing modes, particularly in vehicle-mounted displays, where personal information needs protection without compromising safety.
Innovation Solution
A display device with pixels containing first and second light emitting elements of different viewing angles, controlled by a panel driver that gradually adjusts the on-period ratio of driving signals over multiple frame periods to switch between modes smoothly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a display device uses a single light emitting element with a wide viewing angle for public mode, then visibility for multiple users is improved, but privacy protection deteriorates because side users can also view the image
Solution Approach 1:
The pixel is divided into multiple light emitting elements (first light emitting element for public mode with wide viewing angle, second light emitting element for private mode with narrow viewing angle) that can be independently controlled. This segmentation allows the display device to switch between public and private modes by activating different light emitting elements based on the vehicle's operating state.
2Speed
If a display device switches abruptly between public and private modes, then mode switching speed is improved, but user experience deteriorates due to sudden changes in image visibility
Solution Approach 1:
The panel driver gradually changes the on-period ratio of driving signals over multiple frame periods when switching between public and private modes. This periodic gradual adjustment creates a smooth transition effect where the image visibility changes incrementally rather than abruptly, improving user experience while still achieving mode switching.
3Loss of information
If a display device uses a narrow viewing angle light emitting element for private mode, then privacy protection is improved, but visibility for side users deteriorates
Solution Approach 1:
The display device dynamically adjusts the viewing angle characteristics by switching between different light emitting elements based on the vehicle's operating state. In private mode, the narrow viewing angle element is activated for privacy protection; in public mode, the wide viewing angle element is activated for broader visibility. This dynamic adaptation resolves the contradiction between privacy and side user visibility.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, and a panel driver configured to drive the display panel. At least one pixel of the plurality of pixels includes a first light emitting element having a first viewing angle, a second light emitting element having a second viewing angle different from the first viewing angle, a pixel circuit configured to generate a driving current, a first transistor configured to provide the driving current to the first light emitting element in response to a first signal, and a second transistor configured to provide the driving current to the second light emitting element in response to a second signal. In response to a mode switching signal, the panel driver gradually changes an on-period ratio of at least one of the first signal and the second signal over a plurality of frame periods.