Flexible Cable Signal Line Grouping for Display Devices
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Solution Overview
Problem
In display devices, the mismatch in process margins between cables and printed circuit boards leads to limitations in cable width and increased signal attenuation due to line resistance, resulting in inefficient high-speed signal transmission and higher manufacturing costs.
Innovation Solution
The use of a cable with reduced margins between adjacent signal lines and the incorporation of dummy pins to prevent short circuits, allowing for narrower cable widths and minimized lengths, thereby enhancing signal transmission efficiency and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the cable width is narrowed to reduce manufacturing costs and improve signal transmission, then the cable width is reduced, but the process margin between adjacent signal lines becomes insufficient, increasing the risk of short circuits
Solution Approach 1:
The patent applies different process margins to different regions of the cable. Specifically, the first process margin is set between signal lines of adjacent signal line groups, while a second, larger process margin is set between signal lines within the same group. This local differentiation allows the cable width to be narrowed overall while maintaining sufficient margins to prevent short circuits in critical areas.
Solution Approach 2:
The signal lines are divided into multiple groups, with different process margin requirements applied to each group. This segmentation allows the cable design to optimize the balance between width reduction and short circuit prevention by treating different signal line relationships differently.
2Length of stationary object
If the cable length is increased to connect distant components, then the connection distance is extended, but signal attenuation due to line resistance increases, deteriorating transmission quality
Solution Approach 1:
The patent changes the electrical parameters of the cable by adjusting the impedance of signal lines and the capacitance between adjacent signal lines. By controlling these parameters, the cable can transmit high-speed signals over longer distances with reduced attenuation. The impedance matching and capacitance control optimize signal transmission characteristics throughout the cable length.
3Reliability
If larger process margins are set in the cable to prevent short circuits, then short circuit prevention is improved, but the cable width must be increased, increasing manufacturing costs
Solution Approach 1:
The patent applies different process margins to different regions of the cable. Specifically, the first process margin is set between signal lines of adjacent signal line groups, while a second, larger process margin is set between signal lines within the same group. This local differentiation allows the cable width to be narrowed overall while maintaining sufficient margins to prevent short circuits in critical areas.
Data Source
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Figure 2B
AI summary
In at least one embodiment, the present disclosure provides a cable. The cable includes a film (221). A first cable pin (201a) and a second cable pin (202a) are spaced apart from one another in a first pin region (210a) on a first face of the film (221). A third cable pin (203a) and a fourth cable pin (204a) are spaced apart from one another in a second pin region (220a) on a second face of the film (221) that is opposite the first face. A first cable signal line (201c) on the first face of the film (221) is connected to the first cable pin (201a), and a second cable signal line (202c) on the first face of the film (221) is connected to the second cable pin (202a). A third cable signal line (203c) on the second face of the film (221) is connected to the third cable pin (203a), and a fourth cable signal line (204c) on the second face of the film (221) is connected to the fourth cable pin (204a).