Fast Testing Switch for Narrow-Bezel TFT-LCD Substrates
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Solution Overview
Problem
In TFT-LCD panel manufacturing, the use of shorting bars for cell testing results in high costs and occupies significant space, preventing the achievement of narrow-bezel designs and causing signal interferences during normal operations.
Innovation Solution
A TFT-LCD array substrate with a fast testing switch device that includes multiple switch TFTs, allowing for the connection or disconnection of data and gate testing lines with the display area using external switch control signals, thereby reducing space occupation and preventing signal interferences by ensuring the switch devices are in an off-state during normal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a shorting bar is used for cell testing, then the testing function is achieved, but the space occupation increases and narrow-bezel design cannot be achieved
Solution Approach 1:
The invention extracts the testing function from the physical shorting bar structure and relocates it to a virtual switching mechanism implemented through control circuits and TFT switches. This removes the need for physical shorting bars that occupy space, enabling narrow-bezel designs while maintaining the cell testing capability through electrical switching of testing lines.
Solution Approach 2:
The invention replaces the mechanical/physical shorting bar system with an electrical switching system using TFTs and control circuits. Instead of physically connecting or disconnecting lines with shorting bars, the system uses electrical switches to control the connectivity of testing lines to display lines, achieving the same function without mechanical components.
2Reliability
If a shorting bar is used for cell testing, then the testing function is achieved, but signal interferences occur during normal operations
Solution Approach 1:
The invention implements dynamic control of line connectivity through switching elements that can change the electrical connection state between testing lines and display lines based on operational mode. During normal operation, the switches are controlled to disconnect testing lines from display lines, preventing signal interference. During testing, the switches connect the lines to enable testing functionality.
Solution Approach 2:
The invention introduces switching TFTs and control circuits as intermediary elements between the testing lines and display lines. These intermediaries act as controllable gates that can isolate the testing lines from the display lines during normal operation, preventing signal interference, while allowing connection during testing operations.
3Adaptability or versatility
If the testing lines are always connected to the display area, then the testing function is always available, but the space occupation increases and signal interferences occur
Solution Approach 1:
The system dynamically adjusts the connectivity between testing lines and display lines based on operational requirements. The switching mechanism allows the testing lines to be connected to the display area only when testing is needed, and disconnected during normal operation, providing adaptability while minimizing space occupation and signal interference.
Data Source
AI summary
A fast testing switch device arranged on a TFT-LCD array substrate is disclosed. The fast testing switch device switches the testing signals for testing a display area of the TFT-LCD array substrate. The fast testing switch device includes at least a first switch TFT. The gate of the first switch TFT connects to one control chip and a testing block for receiving the switch control signals from the testing block or the turn-off control signals from the control chip. The source of the first switch TFT connects to one data testing line or one gate testing line, and the drain of the first switch TFT connects to the corresponding data line or gate line of the display area. In addition, a corresponding TFT-LCD array substrate is also disclosed. The above configuration not only can achieve the narrow-bezel design but also can enhance the yield rate of the TFT-LCD array substrate.