LCD short-circuit detection circuit and detection method

Abstract

The invention, which relates to the technical field of LCD short circuit detection, provides an LCD short-circuit detection circuit. A multi-path parallel short-circuit detection system is establishedthrough an acquisition module, a detection module and a multi-path gating device. Under the support of a CPU, an LCD short-circuit detection method is adopted. A detection module is used for carryingout voltage division on a reference voltage; the CPU collects a voltage of a corresponding pin by using the acquisition module; and the collected voltage is compared with a preset normal voltage or arange to analyze a pin with a short-circuit problem and a short-circuit type rapidly, so that the time cost of short-circuit analysis of the LCD signal line is lowered and the short-circuit detectionefficiency is improved. On the basis of the alternative characteristic of the multiplexer, a short-circuit detection system and a CPU driving signal line are distinguished; short-circuit signal detection of an isolated driving lightening signal is carried out before the driving lightening, so that the electrical interference of the short-circuit detection system on the LCD load driving signal iseffectively eliminated and the signal attenuation of the driving signal is avoided.

Description

technical field [0001] The invention relates to the technical field of LCD short circuit detection, in particular to an LCD short circuit detection circuit and a detection method. Background technique [0002] In recent years, with the rapid development of the mobile phone industry, the demand for mobile phone display screens has also increased significantly. Before shipment, mobile phone display screens need to use lighting test tools to conduct multiple electrical tests. During the electrical test process, If the signal line of the mobile phone display interface is short-circuited, the mobile phone display cannot be lit frequently. The display interface of a mobile phone generally includes a large number of high-speed signal lines, ordinary signal lines and power lines. Any short circuit between signal lines or any short circuit between any signal line and signal ground will cause the mobile phone display to fail to light up. It is difficult to analyze such adverse pheno...

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Problems solved by technology

[0004] The invention provides an LCD short-circuit detection circuit and detection method, which solves the technical problem that the existing LCD sh

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