OLED Display Panel Bright Band Elimination via Dynamic Signal Control
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Solution Overview
Problem
Existing OLED display technologies suffer from poor display performance due to periodic bright and dark bands caused by consistent light-emitting control signals, leading to undesirable visual artifacts.
Innovation Solution
A method and display panel design where n frames of images are grouped and controlled to emit light for a consistent total time, with each frame's row of pixels operating in the light-emitting phase for the same duration, and varying light-emitting control signals are used across rows and frames to randomize the cycles of high and low signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same light-emitting control signal is used for all rows of pixels over multiple frames, then the control signal structure is simple and easy to implement, but periodic bright and dark bands appear on the display screen
Solution Approach 1:
The patent applies dynamics by making the light-emitting control signals variable across different frames rather than static and repetitive. Specifically, for n frames of images displayed in sequence, different light-emitting control signals are used for the same row of pixels in different frames, causing the cycles of high and low levels to vary dynamically. This dynamic variation eliminates the periodic pattern that causes bright and dark bands while maintaining display brightness through controlled total light-emitting time.
2Reliability
If the light-emitting control signal maintains a fixed duty cycle, then the brightness control is simple and stable, but rolling or static bright and dark bands are visible on the screen
Solution Approach 1:
The patent applies parameter changes by varying the duty cycle of light-emitting control signals across different frames. While the total light-emitting time for n frames is controlled to maintain average brightness, the duty cycle of individual frames changes. For example, one frame may have a 50% duty cycle while another has a 60% duty cycle, as long as their combined light-emitting time achieves the desired total. This parameter variation disrupts the periodic pattern causing visual artifacts while preserving brightness control through temporal integration.
3Reliability
If multiple pulse cycles are designed in the light-emitting control signal to avoid display problems, then the display stability is improved, but the complexity of the control signal increases
Solution Approach 1:
The patent applies periodic action by using multiple pulse cycles within each frame's light-emitting control signal. Each pulse cycle consists of high and low levels that control pixel emission. By designing 2 or more pulse cycles per frame and varying their arrangement across different frames, the patent achieves display stability through adequate sampling and avoids periodic artifacts. The key is that while multiple pulse cycles are used within each frame, the overall pattern varies from frame to frame, maintaining stability without creating repetitive visual defects.
Data Source
AI summary
Embodiments of the disclosure disclose a display panel, a method for displaying an image on the same and a display device. For the determined brightness mode, every n frames of images to be displayed are taken as a group, and when being displayed, each group of n frames of images is controlled to emit light for the same total amount of time; and when each frame of image is being displayed each row of pixels operate in the light-emitting phase for the same amount of time, so that the images can be displayed with normal brightness in this mode. When n frames of images in a group are being displayed, different light-emitting control signals are transmitted to the same row of pixels. And/or, when each frame of image in a group is being displayed, at least two of light-emitting control signals transmitted to different rows of pixels are different.