Dual-Emitter Pixel Circuit for Flicker-Free Viewing Angle Switching
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Solution Overview
Problem
Existing display technologies in electronic devices experience flickering and visual artifacts during transitions between wide and narrow viewing angle modes, degrading user experience and readability.
Innovation Solution
A pixel architecture with two light-emitting elements per pixel, each driven by a dedicated switching circuit, utilizes a transition control mechanism to gradually adjust the active period of switching signals, enabling smooth and flicker-free mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single light-emitting element is used per pixel, then the device complexity is low, but the display quality during mode transitions deteriorates due to flickering and visual artifacts
Solution Approach 1:
Each pixel is divided into two separate light-emitting elements (first and second light-emitting elements), each capable of independent operation. This segmentation allows the display to switch between different viewing angle modes by controlling different elements, thereby eliminating flickering during mode transitions while maintaining a relatively simple overall structure.
Solution Approach 2:
The pixel circuit unit dynamically controls the switching between the first and second light-emitting elements based on the viewing angle mode. During mode transitions, the circuit gradually adjusts the active period of switching signals to control which light-emitting element is active, enabling smooth transitions without flickering or visual artifacts.
2Speed
If mode switching is implemented abruptly, then the response speed is fast, but the visual comfort deteriorates due to flickering and artifacts
Solution Approach 1:
During mode transitions, the pixel circuit unit employs periodic switching signals with gradually adjusted active periods. The first and second switching signals are activated in a controlled sequence, with their active periods being gradually increased or decreased over a predetermined period. This periodic action with gradual adjustment enables fast mode switching while eliminating flickering and visual artifacts, maintaining visual comfort.
3Reliability
If the active period of switching signals is adjusted gradually, then the visual comfort is improved, but the transition time increases
Solution Approach 1:
The pixel circuit unit adjusts the active period of switching signals gradually only during the critical transition phase, rather than continuously. By controlling the duration of the transition period and using black frames strategically, the system achieves smooth visual transitions without excessive delay, balancing visual comfort with efficient mode switching.
4Reliability
If black frames are inserted during transition period, then the flickering is reduced, but the productivity decreases due to additional frames
Solution Approach 1:
The patent extracts and utilizes black frames specifically during the mode transition period to eliminate flickering and visual artifacts. By inserting black frames only when needed (during transitions) and not during normal operation, the system maintains display stability while minimizing the impact on overall refresh rate and productivity. The black frames are strategically placed to control the gradual adjustment of switching signal active periods.
Data Source
AI summary
An electronic device includes a display panel including a pixel. The pixel includes a first light emitting element, a second light emitting element, and a pixel circuit unit. The pixel circuit unit includes a first switching circuit electrically connected to the first light emitting element and applying a driving current to the first light emitting element in response to a first switching signal activated in a first mode, and a second switching circuit electrically connected to the second light emitting element and applying the driving current to the second light emitting element in response to a second switching signal activated in a second mode. The duration of active periods of the first switching signal and the second switching signal gradually increases or decreases during a predetermined period based on a mode switching time point.