OLED Driving Circuit Dynamic Darkness Insertion for Smear Reduction
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Solution Overview
Problem
Dynamic image smear occurs in OLED display devices when switching between frames, leading to a perceived smearing of previous images, which existing technologies attempt to mitigate by reducing display time through darkness insertion but with limited effectiveness.
Innovation Solution
A method and circuit for driving OLED displays that include a display period and a darkness insertion period, with specific sub-periods for each frame, ensuring non-overlapping display and darkness driving, and adjusting light-emission duty ratios based on sub-pixel gray scales to optimize display timing and reduce smear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If darkness insertion driving is performed to reduce display time duration, then dynamic image smear phenomenon is improved, but display luminance uniformity deteriorates due to luminance borders between rows
Solution Approach 1:
The patent applies dynamics by making the darkness insertion driving pattern variable rather than fixed. Specifically, the number of rows subjected to darkness insertion driving in the first sub-period (a) differs from the number of rows subjected to darkness insertion driving in the second sub-period (n-a), and these values change between different frame periods. This dynamic adjustment causes the luminance border position to shift, preventing it from becoming a fixed perceptible artifact, thereby resolving the contradiction between reducing smear and maintaining luminance uniformity.
2Object-affected harmful factors
If darkness insertion driving is performed on all rows simultaneously, then dynamic image smear is reduced, but display time is increased due to sequential row processing
Solution Approach 1:
The patent applies segmentation by dividing the darkness insertion driving process into two distinct sub-periods: a first darkness insertion sub-period and a second darkness insertion sub-period. Different rows of sub-pixels are assigned to different sub-periods, with rows 1 to a subjected to darkness insertion in the first sub-period and rows a+1 to n subjected to darkness insertion in the second sub-period. This segmentation enables parallel processing of different row groups, reducing the total display time while still achieving effective smear reduction through darkness insertion.
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
The solution effectively minimizes dynamic image smear by varying the position of luminance borders between frames, making them imperceptible to the user, thereby enhancing the moving picture response time and reducing display luminance differences.
Implementation Method 1
In the field of display technology, especially in an Organic Light Emitting Diode (OLED) display device
Data Source
AI summary
Provided is a method for driving a display device including n rows of sub-pixels; the method includes: driving the first frame of image, including: performing normal display driving on the n rows of sub-pixels in a display driving period, performing darkness insertion driving on a rows, from the 1st to ath rows, of sub-pixels in a first darkness insertion sub-period, and performing darkness insertion driving on (n−a) rows, from the (a+1)th to nth rows, of sub-pixels in a second darkness insertion sub-period driving a second frame of image, including: performing normal display driving on the n rows of sub-pixels in a display driving period, performing darkness insertion driving on b rows, from the 1st to bth rows, of sub-pixels in a first darkness insertion sub-period, and performing darkness insertion driving on (n−b) rows, from the (b+1)th to nth rows, of sub-pixels in a second darkness insertion sub-period.