Dual-Viewing-Angle Pixel Switching for Blink-Free Privacy Displays
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Solution Overview
Problem
Existing display devices struggle with seamless switching between public and privacy modes, leading to visible blinking or transitions that compromise user experience and privacy.
Innovation Solution
A display device with pixels comprising first and second light emitting elements of different viewing angles, driven by distinct select signals, and a panel driver that sequentially provides these signals to achieve seamless mode switching by row, using gamma reference voltages specific to each mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device switches between public mode and privacy mode, then the viewing angle control is improved, but visible blinking or transitions occur during mode switching
Solution Approach 1:
The display panel is divided into multiple pixel rows, and the mode switching is performed sequentially row by row rather than all at once. This segmentation of the switching process eliminates visible blinking by transitioning through intermediate states across different rows, resolving the contradiction between viewing angle control and switching smoothness.
Solution Approach 2:
Before completing the mode switch for all pixels, the display device preliminarily switches the mode for certain pixel rows while maintaining the original mode for other rows. This preliminary action creates intermediate transition states that prevent abrupt visual changes, thereby achieving seamless mode switching.
2Adaptability or versatility
If a display device uses a single light emitting element per pixel, then the device complexity is reduced, but the ability to provide different viewing angles is limited
Solution Approach 1:
Each pixel is segmented into multiple light emitting elements (first light emitting element and second light emitting element) with different viewing angles. This segmentation enables the pixel to provide both wide and narrow viewing angles by selectively activating different elements, thus achieving viewing angle variation without excessive complexity.
Solution Approach 2:
Different light emitting elements within the same pixel have different local properties (viewing angles). The first light emitting element provides a first viewing angle while the second light emitting element provides a second viewing angle. This local quality differentiation allows the display to achieve multiple viewing angles while maintaining a relatively simple overall pixel structure.
Data Source
AI summary
A display device according to one or more embodiments of the present disclosure includes: a display panel including a plurality of pixels; and a panel driver configured to drive the display panel, wherein each of the pixels includes: a first light emitting element having a first viewing angle; a second light emitting element having a second 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 select signal; and a second transistor configured to provide the driving current to the second light emitting element in response to a second select signal, and wherein, in a mode switching frame period between a first mode and a second mode, the panel driver is configured to sequentially provide the first and second select signals to the pixels on a row-by-row basis.