Scrolling Addressing Electroluminescent Display Driver Architecture
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Solution Overview
Problem
Active matrix electroluminescent display devices face challenges in reducing motion blur and field flicker when implementing scrolling illumination techniques, which complicate the drive scheme and reduce available time for addressing, especially in high-resolution displays.
Innovation Solution
A driver architecture using a shift register and logic arrangement to generate control voltages for row driver circuitry, allowing for variable pulse durations up to the full field period less the address period, enabling row-by-row addressing and control of light emission periods, facilitating the scrolling illuminated region technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If scrolling illumination technique is implemented to reduce motion blur, then image sharpness is improved, but driver complexity increases and available addressing time is reduced
Solution Approach 1:
The frame period is segmented into distinct phases: an address period for programming pixel data and a light emission period for displaying the image. This temporal segmentation allows the display to achieve sharp images through controlled illumination while maintaining adequate addressing time, resolving the contradiction between image sharpness and driver complexity.
Solution Approach 2:
The display implements dynamic control of the light emission period duration, which can be adjusted based on the specific display requirements. This dynamic parameter control enables optimization of both image sharpness and addressing time without requiring complex driver circuitry, as the emission period can be flexibly adapted to balance these competing requirements.
2Illumination intensity
If light emission period is extended to improve image brightness, then brightness is improved, but motion blur increases
Solution Approach 1:
The display employs periodic illumination with a duty cycle that controls the ratio of light emission time to total frame period. By using periodic action rather than continuous illumination, the system achieves adequate brightness while limiting the duration of light emission in each frame, thereby reducing motion blur. The periodic nature allows the eye to integrate light over time while preventing excessive trailing effects.
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 solution reduces driver complexity, minimizes field flicker, and maintains consistent brightness across the display, allowing for flexible control of the duty cycle and reduced power consumption, especially beneficial for large displays.
Implementation Method 1
an electroluminescent display element
Data Source
AI summary
An active matrix electroluminescent display has means for interrupting the drive of current through the display element. Row driver circuitry for the display has a shift register and logic arrangement (50, 54) for generating the drive voltage for the interrupting means, and which includes a pulse having a duration which can be varied up to substantially the full field period less the address period. The signal or signals propagated through the shift register arrangement (50) control the pulse duration. This arrangement provides reduced driver complexity to allow control for the row by row addressing of the pixels with control of the overall light emission period of each row. The control enables a scrolling addressing scheme to be implemented.