OLED Display Stage Block Sampling Period Control
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Solution Overview
Problem
In organic light emitting display devices, variations in threshold voltages of driving transistors lead to inconsistent current supply to OLEDs, affecting brightness, and existing methods struggle to secure sufficient sampling periods due to shortened horizontal scanning periods as display resolution increases.
Innovation Solution
The implementation of a stage block system that generates and controls scan signals and emission control signals for multiple horizontal lines, allowing for overlapping sampling periods and data write periods to ensure consistent voltage application across OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the horizontal scanning period is shortened to increase display resolution, then the display resolution is improved, but the sampling period becomes insufficient
Solution Approach 1:
The display panel is divided into multiple blocks, each block containing multiple horizontal lines. The stage block generates scan signals and emission control signals for each block independently, allowing parallel processing of multiple horizontal lines within a block. This segmentation enables the sampling operation to be performed simultaneously for multiple lines, effectively increasing the sampling period despite shortened horizontal scanning periods required for high resolution.
2Reliability
If the sampling period is extended to compensate for threshold voltage variations, then the brightness consistency is improved, but the horizontal scanning period becomes insufficient
Solution Approach 1:
The stage block performs the sampling operation in advance during the sampling period, saturating the gate-source potential of the driving transistor with the threshold voltage before the data write period begins. By completing the threshold voltage compensation sampling beforehand, the invention ensures that the driving transistor is properly compensated for brightness consistency, while the subsequent data write and emission periods can proceed without delay, maintaining high horizontal scanning speed.
3Measurement precision
If multiple horizontal lines are scanned sequentially to ensure proper sampling, then the sampling accuracy is improved, but the overall scanning time increases
Solution Approach 1:
The invention merges the sampling operations for multiple horizontal lines by processing them in parallel within the same block. The stage block generates scan signals and emission control signals that enable simultaneous sampling across multiple lines in a block, rather than sequentially scanning each line. This merging of operations maintains sampling accuracy for threshold voltage compensation while significantly reducing the overall scanning time required.
Data Source
AI summary
An organic light emitting display device includes a display panel and a stage block. The display panel includes 4m (m is a natural number) number of horizontal lines in which organic light emitting diodes (OLEDs) are arranged. The stage block provides a scan signal and an emission control signal to each of the horizontal lines. An i (i is a natural number equal to or smaller than m) stage block includes a block signal generating unit, an emission control signal generating unit, and a plurality of scan signal generating units.