Display Device Drive Method for Afterimage Elimination
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Solution Overview
Problem
Display devices face challenges in eliminating afterimages when switching from a low-power drive mode to a normal drive mode, leading to inefficient power consumption and image quality issues.
Innovation Solution
A display device and method that involve a display panel with specific transistor configurations and voltage management, including a first period for initializing threshold voltage, an active period for writing data, and a simultaneous light-emitting period to remove afterimages by using a high-level second power source voltage to turn off organic light emitting diodes during the transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates in a low-power drive mode to reduce power consumption, then power consumption is reduced, but afterimages occur when switching to normal drive mode
Solution Approach 1:
The patent applies preliminary action by initializing the threshold voltage of the first transistor and turning off the organic light emitting diode during a first period before the active period when switching from low-power to normal drive mode. This preliminary initialization prevents afterimage formation before normal operation begins, allowing the display to transition modes without residual image artifacts while maintaining power-saving benefits during static display periods.
2Manufacturing precision
If the drive mode is switched from low-power to normal mode, then image quality is improved, but afterimages are generated
Solution Approach 1:
The patent applies preliminary action by initializing the threshold voltage of the first transistor and turning off the organic light emitting diode during a first period before the active period when switching from low-power to normal drive mode. This preliminary initialization prevents afterimage formation before normal operation begins, allowing the display to transition modes without residual image artifacts while maintaining power-saving benefits during static display periods.
3Object-affected harmful factors
If a high-level second power source voltage is applied to turn off the organic light emitting diode, then afterimages are eliminated, but power consumption increases during transition
Solution Approach 1:
The patent applies periodic action by implementing a specific timing sequence where a high-level second power source voltage is applied only during a brief first period before the active period, then reverted to normal operation. This temporary, periodic application of high voltage effectively eliminates afterimages by turning off the organic light emitting diode and initializing transistors, while minimizing power consumption impact by limiting the high-power state to only the necessary initialization window rather than continuous operation.
Data Source
AI summary
A display device includes data lines, scan lines, and pixels. Each of the pixels includes an organic light emitting diode, a first transistor (OLED), and a second transistor. The first transistor is electrically connected to an anode of the OLED. The second transistor is electrically connected to the first transistor, a scan line among the scan lines, and a data line among the data lines. The second transistors of the pixels may receive instances of a reference voltage from the data lines during a first period of a frame. The second transistors of the pixels may simultaneously receive instances of a turn-on scan signal from the scan lines during the first period of the frame. Cathodes of the OLEDs of the pixels may receive instances of a turn-off voltage for the OLEDs to turn off during the first period of the frame.