Pentile Display Demux Voltage Distribution
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Solution Overview
Problem
Existing display devices face issues with display quality due to time differences in data voltages stored in pixels, leading to display failures and defects, particularly in pentile sub-pixel structures where voltage differences affect luminance uniformity.
Innovation Solution
A display device with a pentile sub-pixel structure and a demultiplexer (demux) structure that reduces the number of data driver output terminals, using a two-data line structure to extend data writing and compensation times, and controlling the switching order and data voltage output to uniformly distribute floating and connection states of voltages across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional data driver structure with sufficient output terminals is used, then all pixels can be driven simultaneously with adequate data writing time, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the display panel into different pixel groups (first pixel group and second pixel group) that are driven by different scan signals (first scan signal and second scan signal). This segmentation allows the data driver to write data to different pixel groups at different times, extending the overall data writing period without requiring additional output terminals. The segmentation of scanning operations enables time-division multiplexing that resolves the contradiction between maintaining reliability and reducing device complexity.
Solution Approach 2:
The patent implements periodic scanning by alternating between first scan signals and second scan signals across different pixel groups. The data driver periodically writes data to different pixel groups in a cyclic manner, extending the data writing time through periodic operation. This periodic action allows the same data driver outputs to serve multiple pixels over time, reducing the need for additional output terminals while maintaining adequate data writing time for each pixel.
2Productivity
If data is written to all pixels within a single horizontal period, then productivity is high, but the data writing time per pixel is insufficient leading to display defects
Solution Approach 1:
The patent segments the pixel array into multiple groups that are scanned at different times. Instead of writing data to all pixels simultaneously in one horizontal period, the data driver writes data to the first pixel group during one scan period and to the second pixel group during another scan period. This segmentation extends the total data writing time while maintaining high productivity through parallel processing of different pixel groups.
Solution Approach 2:
The patent dynamically adjusts the scanning sequence by alternating between different scan signals (first scan signal and second scan signal) for different pixel groups. This dynamic scanning approach allows the system to adapt the data writing timing to ensure adequate writing time for each pixel group while maintaining overall high productivity. The dynamic switching between scan signals enables flexible time management for data writing operations.
Data Source
AI summary
A display device includes a display unit including a first pixel, a second pixel disposed adjacent to the first pixel in a first direction, a third pixel disposed adjacent to the first pixel in a second direction crossing the first direction, and a fourth pixel disposed adjacent to the third pixel in the first direction. Each of the first to fourth pixels includes a first sub-pixel and a second sub-pixel. The display device further includes a data driver that outputs a plurality of data voltages, a selective output unit that outputs the data voltages to the first to fourth pixels in a different order for each of a plurality of frames, and a scan driver that outputs a first scan signal to the first and second pixels and outputs a second scan signal, which is delayed from the first scan signal, to the third and fourth pixels.