OLED Scan Signal Timing for Luminance Blemish Suppression
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices suffer from luminance blemishes due to varying current flow in pixels, especially at low intensity gray scales, resulting in inconsistent display quality.
Innovation Solution
The OLED display device adjusts the scan-on periods of scan signals based on the gray scale of the image data, increasing the scan-on periods for low gray scales to reduce luminance blemishes and enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If scan-on periods are increased for low gray scales, then luminance blemishes are suppressed and display quality is improved, but the scanning time and frame rate may be affected
Solution Approach 1:
The patent applies dynamics by making the scan-on period variable rather than fixed. The scan-on period is dynamically adjusted based on the gray scale level being displayed, with longer periods allocated to low gray scales that are more prone to luminance blemishes. This dynamic adaptation allows the system to optimize display quality for each gray scale level while managing overall scanning time.
Solution Approach 2:
The patent changes the temporal parameter of the scan signal by varying the scan-on period duration according to gray scale requirements. Specifically, the scan-on period is extended for low gray scales (e.g., 0-127) and reduced for high gray scales, thereby adapting the timing parameters to the specific needs of different luminance levels to suppress luminance blemishes.
2Stability of the object's composition
If scan-on periods are extended for low gray scales, then current flow consistency is improved, but the overall scanning speed decreases
Solution Approach 1:
The patent applies local quality by differentiating the scan-on period duration based on the specific gray scale level being displayed. Instead of using a uniform scan-on period for all gray scales, the system assigns longer scan-on periods specifically to low gray scales (0-127) where current flow consistency is more critical, while using shorter periods for high gray scales. This localized optimization ensures current stability where needed without uniformly reducing scanning speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This adjustment effectively suppresses luminance blemishes and improves image quality by ensuring consistent current flow across pixels, particularly at low intensity gray scales, thereby enhancing the overall display quality.
Implementation Method 1
The OLED may emit light by gray scales corresponding to the current flowing therein
Data Source
AI summary
An organic light emitting diode (OLED) display device is disclosed. In one aspect, the OLED display device includes a driver that receives image data and generates a data signal and a scan signal corresponding to the image data, and an organic light emitting display panel that receives the data signal and the scan signal and displays an image corresponding to the image data, wherein the scan signal includes a scan-on period and a scan-off period, and when gray scales of the image data increase, the length of the scan-on period increases.