Display Device Gate Driver Segmentation for Signal Writing
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Solution Overview
Problem
Display devices face degradation in quality due to the short period for selecting gate lines, which affects the writing of data signals in pixels, especially when transitioning between moving and still images, leading to reduced display quality.
Innovation Solution
A display device structure with a gate driver and pixel portion that outputs scan signals in alternating frame periods to ensure a sufficient period for writing data signals, utilizing transistors with oxide semiconductors to minimize off-state current and maintain image quality across frame periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of gate lines and signal lines is increased to support more pixels, then the display resolution is improved, but the period for selecting a gate line in one row becomes shorter, causing data signal writing period to be insufficient and display quality to degrade
Solution Approach 1:
The patent divides the gate lines into two groups: first gate lines and second gate lines. The gate driver sequentially selects first gate lines in a first frame period and second gate lines in a second frame period, effectively segmenting the gate line selection process into two phases across two frame periods. This segmentation allows each phase to have sufficient time for data signal writing while maintaining high display resolution through the increased number of gate lines and signal lines.
2Loss of time
If the frame rate is reduced to lengthen the gate line selection period, then the data signal writing period is ensured, but the period for displaying one frame becomes longer, degrading display quality particularly in moving image display
Solution Approach 1:
The patent segments the frame display process into two frame periods: a first frame period for displaying first images using first gate lines, and a second frame period for displaying second images using second gate lines. By interleaving the selection of first and second gate lines across these two frame periods, the system ensures sufficient data signal writing time for each gate line group while maintaining the ability to display images at a higher effective frame rate, thus resolving the contradiction between writing period length and display quality.
3Adaptability or versatility
If the gate driver outputs scan signals to all gate lines in each frame period, then the display coverage is complete, but the time available for data signal writing in each row is insufficient, degrading display quality
Solution Approach 1:
The patent segments the gate line selection across two frame periods: first gate lines are selected in the first frame period, and second gate lines are selected in the second frame period. This temporal segmentation allows the gate driver to output scan signals to all gate lines (first and second gate lines) across the two frame periods, ensuring complete display coverage, while providing sufficient time for data signal writing during each selected period.
Solution Approach 2:
The patent implements periodic action by alternately selecting first gate lines in the first frame period and second gate lines in the second frame period. This periodic selection pattern ensures that all gate lines are eventually selected and displayed while maintaining sufficient time for data signal writing during each periodic cycle, thus resolving the contradiction between complete display coverage and adequate writing time.
Data Source
AI summary
A display device or the like with a novel structure which can ensure a sufficiently long period for writing data signals in pixels is provided. A display device or the like with a novel structure which can display an image of one frame without greatly degrading display quality is provided. The display device includes a gate driver and a pixel portion. The pixel portion includes a plurality of pixels. The gate driver is configured to output a first scan signal to a first gate line in a first frame period. The gate driver is configured to output a second scan signal to a second gate line in a second frame period. The second gate line is a gate line next to the first gate line. The pixels are configured to hold data signals, which are written in the pixels in the first frame period, in the first frame period and the second frame period.