Active Panel Conditioning for LED Display Hysteresis
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Solution Overview
Problem
LED displays, such as AMOLED and μLED, suffer from visual artifacts like image retention and ghost images due to hysteresis in driver TFTs, which cause previous images to persist on the screen for an extended time.
Innovation Solution
Active panel conditioning is applied to the display when it is off, using a common mode waveform signal dynamically selected based on previous image characteristics to accelerate hysteresis settling and remove retained images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active panel conditioning is applied to accelerate hysteresis settling, then image retention is reduced, but power consumption increases and display timing is disrupted
Solution Approach 1:
The patent applies panel conditioning signals periodically at specific intervals (e.g., after displaying high-contrast images or at predetermined time intervals) rather than continuously. This periodic application maintains image retention reduction effectiveness while minimizing overall power consumption by activating the conditioning only when necessary.
Solution Approach 2:
The patent dynamically adjusts parameters of the panel conditioning signal including amplitude, duration, and frequency based on display content and environmental conditions. By changing these parameters adaptively, the system achieves effective hysteresis settling with lower power consumption compared to fixed high-intensity conditioning.
2Reliability
If active panel conditioning is applied to remove retained images, then display clarity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements a universal panel conditioning circuit that can be integrated into existing display manufacturing processes without requiring entirely new hardware. The conditioning signal generator and control logic are designed to work with standard display components, reducing manufacturing complexity while maintaining display clarity improvement.
Solution Approach 2:
The system incorporates automatic detection of image retention conditions and self-adjusting panel conditioning parameters, reducing the need for complex external control systems and manual calibration during manufacturing and operation.
3Speed
If panel conditioning signal is applied during display operation, then hysteresis settling is accelerated, but image transition smoothness deteriorates
Solution Approach 1:
The patent applies panel conditioning signals during specific periods when the display is not actively transitioning between images, such as during black frames or refresh intervals. This timing strategy accelerates hysteresis settling without interfering with image transition smoothness, as the conditioning occurs during natural display refresh cycles rather than during content transitions.
Solution Approach 2:
The system applies panel conditioning signals in advance during display off periods or between image transitions, preparing the display for upcoming content changes. This preliminary conditioning accelerates hysteresis settling before images are displayed, preventing artifacts without disrupting the smoothness of actual image transitions.
Data Source
AI summary
The present disclosure relates generally to systems and methods that may reduce a reduction in visual artifacts related to hysteresis of a light emitting diode (LED) electronic display. In one example, an electronic device may include a controller. The controller is may provide a signal to a pixel of a display of the electronic device while at least a portion of the display is turned off. The signal may include a first current and a second current. The first current may be designed to increase an ambient temperature corresponding to the pixel. The second current may be generated as part of an active panel conditioning operation. By applying the first current and the second current, hysteresis settling times from the pixel may improve, therefore improving speeds of sensing and compensation operations of the electronic device.