TFT Substrate Control Line Assembly for Non-Rectangular Display Load Balance
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Solution Overview
Problem
In display devices with non-rectangular display areas, differences in scanning line lengths lead to varying loads, causing sharp falls in pulse signals and resulting luminance differences across the screen, making load adjustment difficult, especially when multiple scanning lines control a single pixel circuit.
Innovation Solution
The display device employs a control line assembly arrangement where first and second control lines are grouped and arranged in non-display areas with capacitor electrodes, allowing for simplified load adjustment by ensuring control lines of the same type are adjacent to each other, and capacitor electrodes are connected to control line assemblies in the non-display area to match loads across different control line types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scanning lines of different lengths are used in a non-rectangular display area, then the display can accommodate non-rectangular shapes, but the load on scanning lines varies causing luminance differences
Solution Approach 1:
The patent applies local quality by providing dummy load electrodes specifically to scanning lines that require additional load, rather than uniformly adding load to all scanning lines. The dummy load electrodes are selectively positioned based on the specific scanning line's characteristics (length and number of connected pixel circuits), creating localized corrections that match the specific needs of each scanning line while maintaining overall system functionality.
2Reliability
If dummy load is added to short scanning lines, then load balance is improved, but adjustment becomes difficult when multiple scanning lines control a single pixel circuit
Solution Approach 1:
The patent segments the dummy load compensation into individual, independently controllable dummy load electrodes for each scanning line. This segmentation allows each scanning line's load to be adjusted independently through its own dummy load electrode, simplifying the adjustment process even when multiple scanning lines control a single pixel circuit, as each scanning line's load characteristics can be compensated separately.
3Area of stationary object
If control lines are arranged with different types mixed together, then space utilization is improved, but load adjustment complexity increases
Solution Approach 1:
The patent merges control lines of the same type from different groups and arranges them adjacently in the non-display area. This merging strategy groups similar control lines together, allowing for systematic and simplified load adjustment since control lines of the same type can be handled uniformly. The arrangement maintains efficient space utilization while reducing adjustment complexity through pattern recognition and batch processing of similar control lines.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This arrangement simplifies load adjustment across the display device, ensuring consistent voltage application to pixel electrodes and minimizing luminance differences, even with varying scanning line lengths and numbers of thin film transistors.
Implementation Method 1
a capacitor electrode facing the plurality of second control lines in the non-display area
Data Source
AI summary
Different groups include the same type of control lines. The first control lines are arranged such that control lines of different types belonging to each of group are adjacent to each other. In the second area, the second control lines are arranged such that control lines of different types belonging to each group are adjacent to each other. In the non-display area, the second control lines are arranged such that control lines of the same type belonging to different groups are adjacent to each other. The capacitor electrode includes portions connected to each other and arranged in the second direction. Each portion faces each other for control lines of the same type adjacent in the non-display area. Any of the portions and any of the other portions differ in width in the first direction.