Display Panel Test Terminal Signal Delay Reduction
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Solution Overview
Problem
The signal delay in panel lighting tests of special-shaped display panels due to longer signal lines and resistance issues leads to inaccurate test results and misjudgments, especially when switching devices are arranged along arcs, causing some switches to turn on later and fail to receive the panel lighting signal timely.
Innovation Solution
A display panel design with a panel lighting test terminal connected to the closest switching unit through a shorter first line, reducing resistance and signal delay, and a panel lighting test method where the terminal outputs turn-on signals in a time division manner to all switching units, ensuring simultaneous activation and accurate signal transmission to data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If switching devices are arranged along arcs to match the rounded rectangle shape of the display panel, then the display panel can achieve special-shaped design requirements, but the distance between the test terminal and the first switching device increases, resulting in larger resistance and signal delay
Solution Approach 1:
The patent introduces an i-th switching unit as an intermediary node between the test terminal and other switching units. The test terminal directly connects to this intermediate switching unit, which then connects to other switching units in sequence. This intermediary approach shortens the direct signal path from the test terminal while maintaining the ability to control all switching units, thereby reducing signal delay and resistance without compromising the rounded rectangle shape design.
2Reliability
If the test terminal is connected to all switching devices through long lines to cover the entire panel, then all switching devices can be controlled, but the resistance becomes too large causing signal delay and test inaccuracy
Solution Approach 1:
The patent segments the control path by introducing an intermediate switching unit that divides the signal distribution network. Instead of connecting the test terminal directly to all switching devices through long lines, the signal is first transmitted to the intermediate switching unit through a short line, which then distributes signals to other switching units. This segmentation reduces the maximum line length from the test terminal, minimizing resistance and signal delay while maintaining comprehensive control over all switching devices, thereby improving test accuracy.
Data Source
AI summary
Provided is a display panel, a panel lighting test method thereof, and a display device. The display panel includes a display area and a non-display area. The display area includes a plurality of data lines, and at least two of data lines are different in length in the display area. The non-display area includes a panel lighting test terminal for inputting panel lighting signals to the display panel and a switching circuit including a plurality of switching units, and each switching units is associated to at least two data lines. The panel lighting test terminal is connected to the plurality of switching units, and connected to an i-th switching unit closest to the panel lighting test terminal through first lines. The display panel for image display solves the problem of the insufficient test accuracy due to signal delay in the related art.