Full contact test circuit for TFT (Thin Film Transistor) array substrate

Abstract

The invention provides a full contact test circuit for a TFT (Thin Film Transistor) array substrate, which is characterized in that a test chip (5) is arranged outside a panel cutting boundary line (7), the size of each test terminal (51) on the test chip (5) and the distance between the adjacent test terminals (51) are allowed to be increased, and the success rate of enabling test equipment to becontacted with the test terminals (51) can be improved; the test chip (5) is cut off during panel cutting, wires (35) connecting the test terminals (51) and driving terminals (31) on a driving chip (3) are made of a conductor (S) located at the same layer with an active layer of a TFT in the TFT array substrate, and the risk of line corrosion and electrostatic discharge occurred after panel cutting can be prevented; and the test terminals (51) need not to be covered with an insulating organic layer because the test chip (5) is cut off during panel cutting, so that the test is allowed to be performed both after the source / drain electrode of the TFT in the TFT array substrate is manufactured and under a condition that the whole TFT array substrate is manufactured.

Description

technical field [0001] The invention relates to the technical field of display panel detection, in particular to a full-contact test circuit for a TFT array substrate. Background technique [0002] Organic Light Emitting Display (OLED) has self-illumination, no backlight, high contrast, thin thickness, wide viewing angle, fast response, can be used for flexible panels, wide operating temperature range, structure It is considered to be an emerging application technology for the next generation of flat panel displays due to its excellent characteristics such as simple manufacturing process. [0003] OLED display panels can be divided into passive matrix (Passive Matrix, PM) OLED and active matrix (Active Matrix, AM) OLED according to the driving type, namely direct addressing and thin film transistor (Thin Film Transistor, TFT) matrix Two classes of addressing. The AMOLED display panel includes a TFT array substrate on which pixels (Pixels) arranged in an array are arranged....

AI Technical Summary

Problems solved by technology

[0008] C, as the number of test terminals 301 in the test chip 300 increases, the metal area occupied by all test terminals 301 is relatively large, and the conductivity of the metal is good, so there is a risk of electrostatic discharge (Electro-Static Discharge, ESD).

[0009] In addition, if image 3 As shown, after the TFT array substrate is fabricated, the test terminal 301 in the test chip 300 is covered by an insulating organic layer 900 to prevent impurity particles from falling or water and oxygen from entering, so the existing TFT array substrate full-contact test Lines are only allowed in figure 2 In the case shown, the source / drain of the TFT in the TFT array substrate is manufactured and then tested, and it cannot be image 3 In the case shown, the TFT array substrates are all manufactured and then tested

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