Organic Light Emitting Display Pixel Row Group Segmentation
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Solution Overview
Problem
The increasing number of data and scan lines in organic light emitting displays to achieve higher resolution leads to increased manufacturing costs and potential mura phenomena due to insufficient threshold voltage compensation in reduced scan signal periods.
Innovation Solution
The organic light emitting display is organized into pixel row groups, where threshold voltage compensation is performed simultaneously across all groups, allowing for separate timing of data signal input and compensation, using a 7T2C structure with transistors and capacitors to manage voltage and initialization, enabling efficient demultiplexing and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines and scan lines is increased to achieve higher resolution, then display resolution is improved, but manufacturing cost increases and threshold voltage compensation becomes insufficient
Solution Approach 1:
The patent divides the pixel array into multiple pixel row groups that can be driven sequentially. Each group contains multiple pixel rows that are scanned together, allowing the display to maintain high resolution while reducing the total number of scan lines needed. This segmentation approach enables better threshold voltage compensation within each group while achieving the desired display resolution.
2Measurement precision
If the number of data lines is increased to achieve higher resolution, then display resolution is improved, but the number of circuits in data driver increases
Solution Approach 1:
By segmenting the pixel array into multiple row groups that can be driven sequentially, the patent reduces the total number of data lines and scan lines required. This segmentation allows the data driver to have fewer circuits while still achieving high display resolution, thereby reducing manufacturing cost.
3Measurement precision
If the scan signal period is reduced to increase display resolution, then display resolution is improved, but threshold voltage compensation cannot be adequately performed
Solution Approach 1:
The patent segments the pixel array into multiple row groups that are driven sequentially. This segmentation allows sufficient time for threshold voltage compensation within each group while maintaining high display resolution. The compensation operation can be adequately performed in the reduced period because each group is processed separately and sequentially.
Solution Approach 2:
The patent performs threshold voltage compensation as a preliminary action within each pixel row group before data signal input. By conducting compensation in advance within each group, the system ensures adequate compensation time even when the overall scan period is reduced, thereby maintaining display quality and resolution.
Data Source
AI summary
An organic light emitting display includes a plurality of pixel row groups, a scan driver, a data driver, and a data distributor. Each pixel group includes the same number of pixel rows, and the pixel row groups are sequentially driven. The data distributor demultiplexes data signals for input into the pixels. The data signals are input to the pixels after threshold voltage compensation is performed at substantially a same time for pixels in each of the pixel row groups. Data signals are to be input to pixels in one pixel row group while threshold voltage compensation is performed for pixels in another pixel row group adjacent to the one pixel row group.