OLED Display Driving Method Using Time-Division Signal Control
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Solution Overview
Problem
Existing OLED displays face challenges in efficiently driving pixels with high resolution and reducing dead space, particularly due to the complexity of signal wiring and aperture ratio limitations, which affects luminance and emission control.
Innovation Solution
The OLED display employs a time-divisional control scheme by dividing a frame into subfields and using a scan driver with separate initializing and data writing sections for adjacent pixels, allowing for sequential light emission and reducing signal overlap, thereby increasing resolution and minimizing dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scan line is used for both odd and even pixels, then device complexity is reduced, but signal timing conflicts occur between initializing signals and scan signals
Solution Approach 1:
The patent resolves the timing conflict by transitioning from spatial separation (separate physical lines) to temporal separation (different time slots on the same line). The scan driver outputs initializing signals and scan signals at different time points on the same scan line, eliminating signal interference while maintaining wiring simplicity. This temporal dimension approach allows single-line sharing without timing conflicts.
Solution Approach 2:
The scan driver operates in periodic cycles, alternating between outputting initializing signals and scan signals on the same scan line. During odd field periods, initializing signals are output; during even field periods, scan signals are output. This periodic time-division multiplexing ensures that both signal types are transmitted reliably without overlapping or interfering with each other.
2Device complexity
If adjacent pixels share the same scan line and data line, then device complexity is reduced, but light emission control becomes difficult
Solution Approach 1:
The patent implements dynamic control of light emission by introducing separate light emission control lines for odd and even pixels. While odd and even pixels share scan and data lines for simplified wiring, dedicated light emission control lines (EMSO for odd, EMSO for even) allow independent timing control of light output. This dynamic separation enables precise control over which pixels emit light at any given moment, resolving the control difficulty caused by shared wiring.
3Manufacturing precision
If high resolution is achieved with more pixels, then display quality improves, but dead space increases affecting aperture ratio
Solution Approach 1:
The patent merges the control of odd and even pixels onto shared scan lines and data lines, reducing the number of separate wiring channels needed. This consolidation minimizes the space required for signal transmission paths, thereby reducing dead space between pixels and improving the aperture ratio. By combining control resources rather than providing separate dedicated lines for each pixel, the design achieves high resolution while maximizing light-emitting area.
Data Source
AI summary
An organic light emitting diode (OLED) display includes a display unit including a plurality of pixels connected to a plurality of data lines, a plurality of scan lines, a plurality of initializing control lines, and a plurality of light emission control lines, a scan driver to output scan signals to the scan lines and initializing signals to the initializing control lines, and a data driver to output data signals to respective ones of the data lines. A first pixel and a second pixel may be commonly connected to a scan line and a data line. The scan driver may output at least one first initializing signal and at least one second initializing signal to the first pixel and second pixel, respectively. The scan signals and the first and the second initializing signals may be activated at different points in time.