Organic Light-Emitting Display Driving With Periodic Black Data
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Solution Overview
Problem
Existing organic light-emitting displays face challenges in reducing motion picture response time (MPRT) without increasing data charging time, particularly when implementing technologies that require high video frame rates for inserting black images.
Innovation Solution
A driving method for organic light-emitting displays that incorporates a black data display period to improve MPRT by controlling the gate-source voltage of driving transistors, using a black data controller to adjust the duty cycle and luminance characteristics without altering the driving frequency, and employing a timing controller to compensate for threshold voltage and mobility variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a black image is inserted between image frames to reduce motion picture response time, then MPRT is improved, but video frame rate must be doubled which shortens data charging time
Solution Approach 1:
The patent implements periodic black image insertion at specific frame intervals (e.g., every 2nd, 4th, or 8th frame) rather than requiring every frame to be doubled. This periodic approach achieves motion picture response time reduction while maintaining adequate data charging time by selectively inserting black images based on content analysis and motion detection.
Solution Approach 2:
The patent dynamically adjusts the black image insertion frequency and timing based on video content characteristics, motion magnitude, and grayscale levels. By changing parameters such as insertion interval, duration, and timing, the system optimizes both MPRT improvement and data charging time maintenance without requiring fixed double frame rate operation.
2Loss of time
If black data is displayed to improve MPRT, then response time is reduced, but luminance characteristics deteriorate in low grayscale regions
Solution Approach 1:
The patent applies different black image insertion strategies to different regions of the display based on local grayscale characteristics. In low grayscale regions where luminance precision is critical, black image insertion is reduced or modified, while in high grayscale regions where motion perception is more important, black image insertion is maintained or enhanced. This local differentiation preserves luminance characteristics while achieving MPRT improvement.
Solution Approach 2:
Instead of applying black image insertion uniformly across all pixels and frames, the patent applies partial action by selectively inserting black images only where needed based on motion detection and grayscale analysis. This partial application reduces the negative impact on luminance characteristics in low grayscale regions while maintaining the MPRT improvement benefit in regions where it is most effective.
3Loss of time
If video frame rate is increased to insert black images, then MPRT improves, but power consumption increases
Solution Approach 1:
The patent reduces power consumption by implementing periodic black image insertion at reduced frequencies (e.g., inserting black images every 2nd, 4th, or 8th frame rather than every frame). This periodic approach maintains MPRT improvement benefits while significantly reducing the power consumption associated with driving OLED pixels at higher frame rates.
Solution Approach 2:
The patent dynamically adjusts operating parameters including frame rate, black image insertion frequency, and pixel drive current to optimize the balance between MPRT improvement and power consumption. By changing these parameters based on content analysis and performance requirements, the system achieves energy-efficient operation without sacrificing motion picture response time reduction.
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 method enhances MPRT by inserting a black data display period, maintaining driving frequency, and improving luminance characteristics, especially in low grayscale regions, thereby reducing luminance differences and enhancing display quality.
Implementation Method 1
When an operating voltage is applied to the anode and the cathode, a hole passing through the hole transport layer HTL and an electron passing through the electron transport layer ETL move to the emission layer EML, forming an exciton. As a result, the emission layer EML generates visible light.
Data Source
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AI summary
Various embodiments provide a driving method of an organic light-emitting display comprising pixels (P) arranged on a first pixel line (HL1) to an nth pixel line (HLn), where n is a natural number, the method comprising: sequentially programming a data voltage (Vdata) for the pixels (P) arranged on the first pixel line (HL1) to the nth pixel line (HLn); sequentially causing the programmed pixels (P) to emit light; and writing black data to the pixels (P) arranged on the first pixel line (HL1), in a period synchronized with the programming of the pixels (P) arranged on a kth pixel line, where k is a natural number greater than 2 and less than or equal to n.