CN207717901U - A kind of LCD opens short-circuit detecting tooling - Google Patents

Abstract

The utility model discloses a kind of LCD to open short-circuit detecting tooling, including MCU, D/A converter module, voltage follower, zero-crossing comparator, direct voltage source and LCD display, the MCU is separately connected D/A converter module and zero-crossing comparator, D/A converter module is also connected with direct voltage source, direct voltage source is also respectively connected with voltage follower and LCD display, and voltage follower is also connected with zero-crossing comparator.The utility model LCD opens short-circuit detecting tooling and is handled by digitized chip so that measurement result is more accurate.In structure, needs to increase positioning pin fixing circuit board, prevent poor contact, cause to judge by accident.This scheme so that the problem of being caused because of liquid crystal display short circuit is thoroughly improved, and reduces finished product scrappage and labor cost, improves the overall efficiency of production, it is greatly convenient that the manufacture of product is provided.

Description

A kind of LCD opens short-circuit detecting tooling

Technical field

The utility model is related to a kind of detection device, specifically a kind of LCD opens short-circuit detecting tooling.

Background technology

Welding quality test is to ensure welded integrality, reliability, the critical process of safety and usability.With The advance in epoch, electronics industry is also developing rapidly.Integrated thought is rooted in the hearts of the people, and people increasingly wish with smaller body Product goes to realize more functions.Thus, electronic component is more done smaller, and wiring board more does smaller, and welding quality increasingly cannot It is qualified or not by visually going detection to judge.Then, various Welding quality test jigs emerge one after another.For SMT welding qualities Detection, we are more by means of AOI automated optical detection equipments.Rosin joint is accurately determined whether there is, mistake is welded, solder skip, Crossover, polarity, the welding phenomenas such as displacement.Working efficiency is greatly improved, fault rate and labor cost are reduced.For straight Plug-in unit material, we more by be naked eyes either magnifying glass, virtually increase the cost and process wind of production in this way Danger.It would therefore be desirable to go liberation labour by tooling, and then improve production efficiency.We are producing one piece with miniature When the wiring board of LCD, since its welding pin is close and thin, certain difficulty is brought to detection.However, the pin short circuit of LCD is bound to Phenomena such as causing device failure or abnormal display, so in order to solve this problem, in the case where not destroying element and wiring board, A kind of jig of practicality is devised, opens short-circuit detecting to detect LCD, the accuracy of enhancing welding detection carries efficient same When reduce application cost.

Utility model content

The purpose of this utility model is to provide a kind of LCD to open short-circuit detecting tooling, to solve to carry in above-mentioned background technology The problem of going out.

To achieve the above object, the utility model provides the following technical solutions：

A kind of LCD opens short-circuit detecting tooling, including MCU, D/A converter module, voltage follower, zero-crossing comparator, direct current Voltage source and LCD display, the MCU are separately connected D/A converter module and zero-crossing comparator, and D/A converter module is also connected with Direct voltage source, direct voltage source are also respectively connected with voltage follower and LCD display, and voltage follower is also connected with Zero-cross comparator Device.

Further technical solution as the utility model：The MCU is microcontroller.

Compared with prior art, the utility model has the beneficial effects that：The utility model LCD opens short-circuit detecting tooling and passes through Digitized chip processing so that measurement result is more accurate.In structure, needs to increase positioning pin fixing circuit board, prevent from connecing It is tactile bad, it causes to judge by accident.This scheme so that the problem of being caused because of liquid crystal display short circuit is thoroughly improved, and reduces finished product Scrappage and labor cost improve the overall efficiency of production, and it is greatly convenient that the manufacture of product is provided.

Description of the drawings

Fig. 1 is the system diagram of the utility model.

Fig. 2 is the structure chart of the utility model.

Fig. 3 is the work flow diagram of the utility model.

In figure：1- master devices；11- display screens；12-NG red lights；13-OK green lights；14-BZ buzzers；15-CAL buttons； 16-Test buttons；17- communication terminals；18- power switches；19- power supplys；2- is from device；21- communication terminals；22- glands one； 23- glands two；24-13 foot PIN needles；25-2 foot PIN needles；26- wiring boards rest area；2601,2602,2603- wiring boards positioning Pin.

Specific implementation mode

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work The every other embodiment obtained, shall fall within the protection scope of the present invention.

Please refer to Fig.1-3, a kind of LCD opens short-circuit detecting tooling, including MCU, D/A converter module, voltage follower, mistake Zero comparator, direct voltage source and LCD display, the MCU are separately connected D/A converter module and zero-crossing comparator, and digital-to-analogue turns Mold changing block is also connected with direct voltage source, and direct voltage source is also respectively connected with voltage follower and LCD display, and voltage follower is also Connect zero-crossing comparator.MCU is microcontroller.

The operation principle of the utility model is：LCD based on MCU controls opens short-circuit detecting scheme.Measurand LCD is supplied Electricity simultaneously carries out voltage sample to its pin, and each pin is divided by series resistance, and each pin current potential is different under open-circuit condition, short Under line state, the pin potential that short cut with each other is identical.The analog quantity of voltage is converted into digital quantity by digital analog converter, Compare whether the potential of these pins has identical entry with Master control chip MCU.If comparator by low level output to MCU, The I/O mouths of MCU export Start printed words, in the detection incipient stage；Otherwise, into detection-phase, MCU carries out voltage comparison, if There is identical entry, NG is shown, with sound-light alarm；Otherwise, show that Pass, detection are qualified.

Fig. 2 is structural schematic diagram：

1, master device, reset test shows test result.

11, display screen, character shows PASS or NG

12, NG red lights, test crash, when red.

13, OK green lights, test passes, green light.

14, BZ buzzers, test crash, buzzer are rung.

15, CAL buttons, calibration tool are used.

16, Test buttons reset, and eliminate alarm.

17, communication terminal 1, master and slave device communication.

18, power switch

19, power supply, 220V alternating currents.

2, from device, wiring board positioning, test.

21, communication terminal 2, master and slave device communication.

22, gland 1, control test break-make.

23, gland 2, fixing circuit board.

24,13 foot PIN needles test LCD pins.

25,2 foot PIN needles input 5V, check that LCD display is just always on.

26, wiring board rest area.

2601,2602,2603, wiring board positioning pin.

Operating procedure：

The first step：19 connect 220V power supplys, and 18 set open state.

Second step：LCD wiring boards to be detected are put in 26,2601,2602,2603 positioning mistake proofings, 23 are pressed downward, it is fixed Wiring board.

Third walks：LCD is normally lit, and 22 is pressed toward wiring board direction, pin is opened short-circuit detecting and started.

4th step：1 display test result.Qualification, 11 display PASS, 13 is bright；Unqualified, 11 display NG, 12 is bright, 14 sound.

5th step：Certified products put qualified area.Defective work presses 16, cancels alarm, reprocesses, retest.

4. line is summarized：

220V alternating current wires are by this 1 19 position of external receptacle access.

The 21 of 17 and the 2 of connection (including signal, power supply) connection 1.

Short-circuit detecting tooling is opened for a kind of LCD based on MCU controls above, is handled by digitized chip so that measure As a result more accurate.In structure, needs to increase positioning pin fixing circuit board, prevent poor contact, cause to judge by accident.This scheme makes Obtaining the problem of being caused because of liquid crystal display short circuit is thoroughly improved, and is reduced finished product scrappage and labor cost, is improved The overall efficiency of production, it is greatly convenient that the manufacture of product is provided.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this practicality is new in other specific forms Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this practicality is new The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing in the equivalent requirements of the claims will be fallen All changes in justice and range are embraced therein.Any reference numeral in claim should not be considered as limitation Involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiment being appreciated that.

Claims (2)

1. a kind of LCD opens short-circuit detecting tooling, including MCU, D/A converter module, voltage follower, zero-crossing comparator, direct current Potential source and LCD display, which is characterized in that the MCU is separately connected D/A converter module and zero-crossing comparator, digital-to-analogue conversion mould Block is also connected with direct voltage source, and direct voltage source is also respectively connected with voltage follower and LCD display, and voltage follower is also connected with Zero-crossing comparator.

2. a kind of LCD according to claim 1 opens short-circuit detecting tooling, which is characterized in that the MCU is microcontroller.