Organic Light Emitting Display Device Porch Data Generator Crosstalk Reduction
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Solution Overview
Problem
Organic light emitting display devices driven by analog techniques face challenges with low opening ratios and crosstalk issues, leading to degraded display quality due to electrical coupling between lines, especially in high-resolution panels.
Innovation Solution
The implementation of a porch data generator that calculates and sets porch data based on the average value of frame data for each data line or pixel group, reducing the effect of parasitic capacitors and alleviating stripe patterns by adjusting voltage during the porch period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If line to line spacing of the pixel circuit is reduced to increase the opening ratio, then the opening ratio is improved, but crosstalk occurs by electrical coupling between the lines
Solution Approach 1:
The patent applies preliminary anti-action by generating porch data based on average frame data before the active display period, and applying this porch data during the porch period to preemptively counteract the crosstalk that would otherwise occur during the active period. This pre-countermeasure stabilizes the gate electrode voltage before the main display operation begins.
Solution Approach 2:
The patent implements preliminary action by calculating and preparing the average frame data as porch data in advance, before the actual display frame is rendered. This preparatory step ensures that the porch data is ready to be applied during the porch period, preventing crosstalk effects before they can degrade display quality.
2Reliability
If analog driving technique is used to stably display an image, then display stability is improved, but pixel circuit structure becomes complicated and opening ratio decreases
Solution Approach 1:
The patent introduces porch data as an intermediary element between the data driver and the pixel circuits. This porch data acts as a mediator that stabilizes the gate electrode voltage by compensating for crosstalk effects, thereby maintaining display stability without requiring complex pixel circuit structures. The porch data serves as a buffer that simplifies the overall system while achieving the desired stability.
3Object-affected harmful factors
If porch data is generated based on average value of frame data, then crosstalk effect is reduced and stripe patterns are removed, but additional processing is required
Solution Approach 1:
The patent applies parameter changes by transforming the frame data into porch data through averaging. This parameter transformation converts the raw frame data into a stabilized porch data signal that, when applied during the porch period, changes the voltage characteristics to reduce crosstalk effects and eliminate stripe patterns.
Data Source
AI summary
An organic light emitting display device including a display panel including a plurality of scan lines, first through (M)th data lines crossing the scan lines, and a plurality of pixels, where M is an integer greater than 1, a scan driver configured to provide scan signals to the pixels through the plurality of scan lines, a data driver configured to provide data signals to the pixels through the first through (M)th data lines, and a porch data generator configured to generate porch data based on an average value of at least a portion of frame data, and to provide the porch data to the data driver, wherein the data driver is configured to generate the data signals based on the porch data during a porch period, and to generate the data signals based on the frame data during an active period.