Digital Driving Organic Light Emitting Display Sub-Frame Timing
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Solution Overview
Problem
Digital driving techniques for organic light emitting display devices often result in reduced total emission time due to the necessity of a blank sub-frame, leading to shortened element lifetime and insufficient display panel driving timing, along with increased charging-discharging power consumption.
Innovation Solution
A method that calculates and modifies emission times of sub-frames to eliminate the blank sub-frame by allowing errors in emission times, ensuring the sum of emission times equals the total number of scan operations, and shifts sub-frame scan timings to optimize gray level implementation without a blank sub-frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital driving technique divides one frame into multiple sub-frames, then gray level implementation precision is improved, but total emission time is reduced due to blank sub-frame
Solution Approach 1:
The patent extracts and eliminates the blank sub-frame from the digital driving technique. By removing the unnecessary blank sub-frame that displays black color, the total emission time is increased while maintaining the gray level implementation precision through the remaining sub-frames with differently set emission times.
Solution Approach 2:
The patent changes the emission time parameter of each sub-frame to compensate for the removal of the blank sub-frame. By adjusting the emission times of the remaining sub-frames, the total emission time is optimized while preserving the ability to implement precise gray levels through the sum of emission times.
2Loss of time
If digital driving technique uses blank sub-frame, then display panel driving timing is insufficient, but element lifetime is reduced
Solution Approach 1:
The patent removes the blank sub-frame that causes timing issues and reduces element lifetime. By eliminating this unnecessary sub-frame, both the display panel driving timing and element lifetime are improved simultaneously.
Solution Approach 2:
The patent ensures continuous useful action by eliminating the blank sub-frame that interrupts the emission process. The emission time is continuously utilized across all sub-frames without interruption, thereby extending element lifetime and improving driving timing.
3Measurement precision
If digital driving technique increases luminance to compensate emission time reduction, then gray level accuracy is improved, but power consumption increases
Solution Approach 1:
The patent removes the need to increase luminance by eliminating the blank sub-frame. This maintains gray level accuracy through proper emission time distribution without the energy penalty of increased luminance.
Solution Approach 2:
The patent converts the potential harm of reduced emission time into a benefit by redistributing emission times across sub-frames. This maintains gray level accuracy while avoiding the need for increased luminance and associated power consumption.
Data Source
AI summary
A method of digital-driving an organic light emitting display device, which divides one frame into a plurality of sub-frames, is provided. In this method, a total number of scan operations, which are to be performed during the frame, is calculated based on a number of scan-lines and a number of the sub-frames, an emission time of each of the sub-frames is set based on a gray level maximum value and the total number of the scan operations, the emission times of the sub-frames are modified by permitting errors to the emission times of the sub-frames to control a sum of the emission times of the sub-frames to be equal to the total number of the scan operations, and each sub-frame scan timing of the scan-lines is sequentially shifted by N horizontal scan intervals, where N is the number of the sub-frames.