Method for testing defects of blocks of liquid crystal displays
A liquid crystal display, defect testing technology, applied in optical testing flaws/defects, instruments, optics, etc., can solve problems such as failure to expose FPC adhesion defects, FPC prone to falling off, peeling, and LCD not working properly.
Inactive Publication Date: 2014-06-25
OCEANKING DONGGUAN LIGHTING TECH +2
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Problems solved by technology
[0003] Due to the influence of factors such as working environment and usage habits, after long-term use, LCDs configured with FPC integrated circuits may experience deformation of the substrate, causing FPC to have adhesion defects, which may cause abnormalities such as falling off and peeling off, and eventually cause the LCD to fail to work normally.
This kind of abnormality generally occurs after the LCD has been used for a long time, and the conventional testing methods currently used cannot expose possible potential FPC adhesion defects
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[0018] The problem to be solved by the present invention is that after long-term use of LCDs with FPC adhesion defects that cannot be detected by conventional testing methods, the components on the FPC will crack, fall off or peel off due to the influence of environmental changes and electrical effects. The FPC is poorly connected due to such phenomena, and some areas of the LCD cannot receive signals and appear abnormal. This defect of the LCD is usually called a block defect.
[0019] Because FPC is a printed circuit board made of polyimide or polyester film as the base material, it is inconsistent with other connecting parts expansion rate and shrinkage rate, therefore, the invention provides a kind of liquid crystal display block defect testing method, such as figure 1 shown, including the following steps:
[0020] Step S110: Power on the liquid crystal display to make the liquid crystal display work.
[0021] The liquid crystal displays are extracted from the production ...
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The invention discloses a method for testing defects of blocks of liquid crystal displays. The method includes steps of powering on the liquid crystal displays and enabling the liquid crystal displays to be in working states; testing temperature stress of the liquid crystal displays; checking electric properties and the appearance quality of the liquid crystal displays, and detecting flexible printed circuits of the liquid crystal displays to determine whether the flexible printed circuits have adhesion defects or not. The method has the advantages that the temperature stress of the liquid crystal displays is tested, and the liquid crystal displays are circularly placed in low-temperature and high-temperature environments, so that exposure of the defects of the blocks of the liquid crystal displays can be accelerated; the electric properties and the appearance quality of the FPCs (flexible printed circuits) are checked, so that the FPCs with the adhesion defects can be found, and the potential problem, which can possibly occur after the liquid crystal displays are used for a long time, of deterioration of the performance of the liquid crystal displays or even incapability of normally working of the liquid crystal displays due to deterioration of adhesion of the FPCs can be exposed within a short time at liquid crystal display design stages.
Description
technical field [0001] The invention relates to the technical field of liquid crystal displays, in particular to a method for testing block defects of liquid crystal displays. Background technique [0002] FPC (Flexible Printed Circuit) is a highly reliable and excellent flexible printed circuit board made of polyimide or polyester film as the base material, as an important electronic component in It has been widely used in various industries. FPC has the characteristics of high wiring density, light weight, and thin thickness. In order to save volume more effectively and achieve a certain degree of accuracy, LCD (Liquid Crystal Display) in electronic products such as digital cameras, mobile phones, and notebook computers Both adopt FPC integrated circuit configuration. [0003] Due to the influence of factors such as working environment and usage habits, LCDs configured with FPC integrated circuits may deform the substrate after long-term use, causing FPCs to have adhesio...
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Login to View More IPC IPC(8): G02F1/13G01N21/88
Inventor 周明杰王永清
Owner OCEANKING DONGGUAN LIGHTING TECH