OLED Data Driver Channel Segmentation for Short-Circuit Prevention
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Solution Overview
Problem
The existing methods for adding a sensing circuit to OLED displays have a high probability of short-circuiting between sensing lines and data lines due to their parallel disposition, which affects multiple subpixels and leads to display defects and inaccurate sensing results.
Innovation Solution
The data driver is configured with first channel groups for outputting data signals, second channel groups for outputting and sensing a sensing voltage, and third channel groups for outputting a high potential voltage, where the second channel groups are successively disposed every M channels, spaced apart from data lines to reduce the likelihood of short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing lines are disposed in the same direction as data lines to enable sensing circuit operation, then sensing function is achieved, but the probability of short-circuiting between sensing lines and data lines increases
Solution Approach 1:
The patent changes the spatial arrangement by disposing sensing lines in the column direction (vertical) while data lines are disposed in the row direction (horizontal). This dimensional separation transforms the parallel disposition problem into an orthogonal arrangement, eliminating the short-circuit risk while maintaining sensing functionality.
Solution Approach 2:
The patent segments the signal line disposition into two independent directions: data lines in the row direction and sensing lines in the column direction. This segmentation allows each type of line to be independently routed without interference, resolving the contradiction between sensing operation and short-circuit prevention.
2Reliability
If sensing lines are disposed between data lines to access subpixels, then sensing capability is provided, but display defects occur due to short-circuits affecting multiple subpixels
Solution Approach 1:
Instead of placing sensing lines between data lines in the same direction (which causes short-circuits), the patent positions sensing lines in the perpendicular column direction. This dimensional change allows sensing lines to access subpixels without intersecting or parallel-running with data lines, eliminating the source of short-circuits and associated display defects.
3Device complexity
If sensing lines share common paths to reduce complexity, then device structure is simplified, but the impact of short-circuits propagates to all shared subpixels
Solution Approach 1:
The patent segments the sensing line routing into column-direction paths that are spatially separated from row-direction data lines. This segmentation maintains structural simplicity while preventing short-circuit propagation, as the orthogonal arrangement ensures that even if a short-circuit occurs, it cannot affect multiple subpixels through shared sensing line paths.
Data Source
AI summary
A data driver and a display device using the same are disclosed. The display device includes a display panel having a display area displaying an image, signal lines including data lines, first power lines, and sensing lines connected to the display panel, and a data driver connected to the signal lines. The data driver includes first channel groups outputting a data signal, second channel groups outputting and sensing a sensing voltage, and third channel groups outputting a high potential voltage. The first channel groups and the third channel groups are defined as a first output unit, and the second channel groups are defined as a second output unit. The second channel groups are successively disposed every M channels, where M is an integer equal to or greater than 2.