OLED Sensing Sequence Overlap for Deterioration Detection
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Solution Overview
Problem
Large-area and high-resolution organic light emitting display (OLED) devices face challenges in reducing the time required for sensing OLED deterioration, leading to image quality degradation and visibility issues due to luminance deviations between pixels.
Innovation Solution
An organic light emitting display system that includes a display panel with a panel driver and a timing controller, which overlaps the sensing driving sequence for display lines in a line sequential manner, allowing for efficient initialization, boosting, and sampling of operating point voltages to reduce sensing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional non-overlapping sensing driving sequence is used for each color pixel, then sensing accuracy is maintained, but sensing time becomes excessively long
Solution Approach 1:
The patent applies preliminary action by performing initialization of subsequent display lines during the boosting period of previous display lines. Specifically, while the first color pixels of display line Li are being sensed (initialization period), the initialization for first color pixels of display line Li+1 is performed in advance during the boosting period of display line Li. This preliminary preparation enables faster sequential sensing without compromising measurement accuracy.
Solution Approach 2:
The patent implements continuity of useful action by overlapping the sensing driving sequences of different display lines. The initialization period of one display line is positioned within the boosting period of the previous display line, creating continuous operation without idle gaps. This overlapping approach ensures that sensing operations proceed continuously across multiple display lines, significantly reducing total sensing time while maintaining sensing precision through proper sequencing.
2Manufacturing precision
If display resolution and area are increased, then display quality is improved, but sensing time increases due to larger number of display lines
Solution Approach 1:
The patent applies segmentation by dividing the sensing operation into distinct periods (initialization period, boosting period, sampling period) and further segmenting the display panel into multiple display lines that can be processed independently but overlapped. By segmenting the sensing sequence into color-specific operations (first color, second color, third color pixels) that can be interleaved across different display lines, the system efficiently handles high-resolution panels with many display lines without proportionally increasing sensing time.
Solution Approach 2:
The patent introduces a temporal dimension to the sensing process by overlapping operations across multiple display lines in time. Instead of processing display lines sequentially in a single dimension, the patent creates a multi-dimensional sensing approach where initialization, boosting, and sampling operations for different display lines occur simultaneously in overlapping time windows. This dimensional transformation enables the system to scale to high-resolution displays with numerous display lines while maintaining efficient sensing times.
Data Source
AI summary
An organic light emitting display and a method of sensing deterioration of the same are discussed. The organic light emitting display includes a display panel including a plurality of display lines, each of the display lines in which a plurality of pixels are arranged, each of the pixels including a light emitting element and a driving element, a panel driver configured to supply a gate signal and a data voltage synchronized with the gate signal to the pixels of the display lines, a sensing unit configured to sense driving characteristics of the pixels, and a timing controller configured to control operation timings of the panel driver and the sensing unit, and overlappingly shift a sensing driving sequence for at least some display lines in accordance with a line sequential manner.