CN105203888A - Overcurrent protection method and device for LCD (liquid crystal display) screen in test - Google Patents
Overcurrent protection method and device for LCD (liquid crystal display) screen in test Download PDFInfo
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- CN105203888A CN105203888A CN201510688750.7A CN201510688750A CN105203888A CN 105203888 A CN105203888 A CN 105203888A CN 201510688750 A CN201510688750 A CN 201510688750A CN 105203888 A CN105203888 A CN 105203888A
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- lcd screen
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Abstract
The invention provides an overcurrent protection method and device for an LCD (liquid crystal display) screen in a test. The LCD screen is connected with a master control end, and the master control end is used for providing a signal source and a test power supply to the LCD screen in an LCD screen test process. The overcurrent protection method comprises the following steps: obtaining an initial signal sent by the LCD screen; amplifying the initial signal by preset times, and obtaining a reference semaphore; judging whether the reference semaphore is larger than a semaphore threshold value or not; if so, triggering the master control end to turn off the test power supply of the LCD screen. The overcurrent protection method and device can realize protection to the LCD screen, avoid the burnthrough of an integrated circuit caused by power supply and signal line short-circuit, avoid the damage to the LCD screen in the test process, and reduce the loss in the test. The test method is simple, and the cost is low.
Description
Technical field
The present invention relates to a kind of electronic technology field, particularly relate to a kind of LCD screen test over-current protection method and device.
Background technology
LCDs (LiquidCrystalDisplay, referred to as LCD) is the one belonging to flat-panel screens, is usually used in the screen display of televisor, computing machine and mobile phone.
At present for LCDs module factory; because it is in the terminal of chain; usually can run into comprise design unreasonable, technique is defective, the extensive various short-circuit conditions caused of production operation, causes voltage signal transmission loop is burnt and damages the situation of LCDs module.
As shown in Figure 1, be the structural representation of existing general LCD screen proving installation 1, comprise main control end 11 and LCD screen 12; Main control end 11 is connected with LCD screen 12, provides signal source and testing power supply according to native instructions to LCD screen 12.Although what in Fig. 1, can proving installation 1 measure signal wire opens poor short circuit state, because the delayed integrated circuit that easily causes artificially handled burnt in the short time, in LCD screen, glass is also easily related scraps, and economic loss is larger.
In prior art, for the problems referred to above, LCDs display module test factory has two kinds extremely usually as follows to LCD screen monitoring:
One, from cost consideration, does not add corresponding protected location, once similar state occurs, namely can damage LCD screen assembly.
Its two, in LCD screen test circuit, add comparatively complicated circuit unit, cost is higher.Such as application number is 201320274044.4, and denomination of invention is that namely signal output protecting device belongs to this kind of situation.
In view of the foregoing, design a kind of circuit structure simple, lower-cost LCD screen test over-current protection method, to avoid the LCD screen caused because of power supply and signal wire short circuit in test process to damage, reduce test loss, become current problem demanding prompt solution.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of LCD screen to test over-current protection method and device, for solving the problem that the LCD screen that causes because of signal wire and power lead short circuit in test process in prior art is damaged.
For achieving the above object and other relevant objects, the invention provides a kind of LCD screen test over-current protection method, described LCD screen is connected with main control end, and described main control end for providing signal source and testing power supply to described LCD screen in LCD screen test process; Described LCD screen test over-current protection method comprises the following steps: obtain the initialize signal that described LCD screen sends; Described initialize signal is amplified and subscribes multiple, to obtain reference signal amount; Judge whether described reference signal amount is greater than semaphore threshold value; If so, the testing power supply that described main control end closes described LCD screen is then triggered.
Preferably, after determining that described reference signal amount is greater than semaphore threshold value, and triggering before described main control end closes the testing power supply of described LCD screen, described LCD screen test over-current protection method also comprises: whether determine that described reference signal amount is greater than semaphore threshold value is behavior first; If so, then after the ticket reserving time, again obtain reference signal amount, and again judge whether described reference signal amount is greater than semaphore threshold value; If not, then the testing power supply that described main control end closes described LCD screen is triggered.
Accordingly, present invention also offers a kind of LCD screen test overcurrent protective device, described LCD screen is connected with main control end, and described main control end is used for providing signal source and testing power supply to described LCD screen in LCD screen test process; Described LCD screen test overcurrent protective device comprises: amplifying circuit, is connected with described LCD screen and described main control end respectively, for obtaining the initialize signal that described LCD screen sends, and described initialize signal is amplified reservation multiple, to obtain reference signal amount; Described main control end also for judging whether described reference signal amount is greater than semaphore threshold value, and when described reference signal amount is greater than semaphore threshold value, closes the testing power supply of described LCD screen.
Preferably, described main control end is connected with described amplifying circuit by GPIO port; When described reference signal amount is greater than semaphore threshold value, the level state of described GPIO port changes, to trigger the testing power supply that described main control end closes described LCD screen.
Preferably, described main control end comprises further: supply unit, is connected with described LCD screen, for providing signal source and testing power supply to described LCD screen; First judging unit, is connected with described amplifying circuit, for judging whether described reference signal amount is greater than semaphore threshold value; Processing unit, is connected with described first judging unit and supply unit, for when described reference signal amount is greater than semaphore threshold value, closes the testing power supply of described LCD screen.
Whether preferably, described main control end also comprises: the second judging unit, is connected with described first judging unit and described processing unit, be behavior first for determining that described reference signal amount is greater than semaphore threshold value; And during for being greater than semaphore threshold value in described reference signal amount for behavior first, triggering described first judging unit after the ticket reserving time, again obtaining reference signal amount, and again judging whether described reference signal amount is greater than semaphore threshold value; And during for being greater than semaphore threshold value in described reference signal amount not for behavior first, trigger the testing power supply that described processing unit closes described LCD screen.
Preferably, described amplifying circuit is CA3140 operational amplifier.
Preferably, described LCD screen and main control end are by MIPI connection.
As mentioned above, LCD screen test over-current protection method of the present invention and device, have following beneficial effect:
Amplified by the signal that LCD screen is sent; if the reference signal amount obtained after amplifying is greater than semaphore threshold value; then trigger the testing power supply that main control end closes described LCD screen; realize the protection to LCD screen; the integrated circuit avoiding power supply and signal wire short circuit to cause burns, and avoids the damage of LCD screen in test process, reduces test loss; this method of testing is simple, and cost is low.
Further, after determining that reference signal amount is greater than semaphore threshold value first, again reference signal amount is obtained after ticket reserving time, and itself and semaphore threshold value are compared, if the reference signal amount again obtained still is greater than semaphore threshold value, then close the testing power supply of LCD, avoid interference the erroneous judgement caused of electric wave.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of LCD screen proving installation in prior art.
Fig. 2 is shown as the schematic flow sheet of a LCD screen of the present invention test over-current protection method embodiment.
Fig. 3 is shown as the schematic flow sheet of another embodiment of LCD screen of the present invention test over-current protection method.
Fig. 4 is shown as the structural representation of a LCD screen of the present invention test overcurrent protective device embodiment.
Fig. 5 is shown as the structural representation of another embodiment of LCD screen of the present invention test overcurrent protective device.
Fig. 6 is shown as the structural representation of another embodiment of LCD screen of the present invention test overcurrent protective device.
Element numbers explanation
1LCD shields proving installation
11,21 main control end
12,22LCD screen
23 amplifying circuits
2LCD screen test overcurrent protective device
211 functional units
212 first judging units
213 processing units
214 second judging units
S11 ~ S14 step
S21 ~ S25 step
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the feature in following examples and embodiment can combine mutually.
It should be noted that, the diagram provided in following examples only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Refer to Fig. 2, for the invention provides the schematic flow sheet of an embodiment of a kind of LCD screen test over-current protection method.Described LCD screen is connected with main control end, and described main control end is used for providing signal source and testing power supply to described LCD screen in LCD screen test process; Described LCD screen test over-current protection method comprises the following steps:
Step S11, obtains the initialize signal that described LCD screen sends;
Step S12, amplifies described initialize signal and subscribes multiple, to obtain reference signal amount;
Step S13, judges whether described reference signal amount is greater than semaphore threshold value;
If whether described reference signal amount is greater than semaphore threshold value, then performs step S14, trigger the testing power supply that described main control end closes described LCD screen;
If described reference signal amount is less than or equal to semaphore threshold value, then perform step S11.
In the present embodiment, LCD screen test over-current protection method is amplified by signal LCD screen sent; if the reference signal amount obtained after amplifying is greater than semaphore threshold value; then trigger the testing power supply that main control end closes described LCD screen; realize the protection to LCD screen; the integrated circuit avoiding power supply and signal wire short circuit to cause burns, and avoids the damage of LCD screen in test process, reduces test loss; this method of testing is simple, and cost is low.
Referring to Fig. 3, is the schematic flow sheet of another embodiment of LCD screen test over-current protection method provided by the invention.Described LCD screen is connected with main control end, and described main control end is used for providing signal source and testing power supply to described LCD screen in LCD screen test process; Described LCD screen test over-current protection method comprises the following steps:
Step S21, obtains the initialize signal that described LCD screen sends;
Step S22, amplifies described initialize signal and subscribes multiple, to obtain reference signal amount;
Step S23, judges whether described reference signal amount is greater than semaphore threshold value;
If described reference signal amount is less than or equal to semaphore threshold value, then perform step S21.
If whether described reference signal amount is greater than semaphore threshold value, then whether perform step S24, determining that described reference signal amount is greater than semaphore threshold value is behavior first;
If described reference signal amount is greater than semaphore threshold value for behavior first, then after the ticket reserving time, perform step S21.
If described reference signal amount is greater than semaphore threshold value for behavior first, then performs step S25, trigger the testing power supply that described main control end closes described LCD screen.
Compared with a upper embodiment; in the present embodiment, LCD screen test over-current protection method can after determining that reference signal amount is greater than semaphore threshold value first; again reference signal amount is obtained after ticket reserving time; and itself and semaphore threshold value are compared; if the reference signal amount again obtained still is greater than semaphore threshold value; then close the testing power supply of LCD, avoid interference the erroneous judgement caused of electric wave.
Refer to Fig. 4, the structural representation of a LCD screen test overcurrent protective device of the present invention embodiment.Described LCD screen 22 is connected with main control end 21, and described main control end 21 for providing signal source and testing power supply to described LCD screen 22 in LCD screen 22 test process; Described LCD screen test overcurrent protective device 2 comprises:
Amplifying circuit 23, is connected with described LCD screen 22 and described main control end 21 respectively, for obtaining the initialize signal that described LCD screen 22 sends, and described initialize signal is amplified reservation multiple, to obtain reference signal amount;
Described main control end 21 also for judging whether described reference signal amount is greater than semaphore threshold value, and when described reference signal amount is greater than semaphore threshold value, closes the testing power supply of described LCD screen 22.
In the present embodiment, described main control end 21 is connected with described amplifying circuit 23 by GPIO port (not shown), when described reference signal amount is greater than semaphore threshold value, namely when abnormality power supply and signal wire short-circuit conditions occur, the semaphore of signal segment is from millivolt instantaneous abrupt change to volt, by amplifying circuit 23, signal amplification can be conducted rapidly to GPIO port, thus cause its saltus step from 0 to 1, and main control end 21 constantly judges the level state of GPIOX port, when it detects that the voltage of this position io jumps to 1 by 0, main control end 21 creates abnormal short circuit with regard to decision circuitry, big current is had to occur, so trigger the testing power supply that described main control end 21 closes described LCD screen 22 at once.The loss of the LCD screen avoiding power supply and signal wire short circuit to cause, reduces testing cost.
In the present embodiment, described amplifying circuit 23 is CA3140 operational amplifier.Described LCD screen 22 and main control end 21 are by MIPI connection.Concrete, described MIPI circuit can be one or more parallel connection.If described LCD screen 22 is connected with main control end 21 by many MIPI circuits in parallel, every bar MIPI circuit is provided with amplifying circuit 22, as long as the reference signal amount wherein a MIPI circuit obtained is greater than semaphore threshold value, just trigger the testing power supply that described main control end 21 closes described LCD screen 22.
Refer to Fig. 5, the structural representation of another embodiment of LCD screen test overcurrent protective device 2 of the present invention.Compared with a upper embodiment, main control end 21 described in the present embodiment comprises further:
Supply unit 211, is connected with described LCD screen 22, for providing signal source and testing power supply to described LCD screen 22;
First judging unit 212, is connected with described amplifying circuit 22, for judging whether described reference signal amount is greater than semaphore threshold value;
Processing unit 213, is connected with described first judging unit 212 and supply unit 211, for when described reference signal amount is greater than semaphore threshold value, closes the testing power supply of described LCD screen 2.
Refer to Fig. 6, the structural representation of another embodiment of LCD screen test overcurrent protective device 2 of the present invention.Compared with a upper embodiment, main control end 21 described in the present embodiment comprises further:
Whether the second judging unit 214, is connected with described first judging unit 212 and described processing unit 213, be behavior first for determining that described reference signal amount is greater than semaphore threshold value; And during for being greater than semaphore threshold value in described reference signal amount for behavior first, triggering described first judging unit 212 after the ticket reserving time, again obtaining reference signal amount, and again judging whether described reference signal amount is greater than semaphore threshold value; And during for being greater than semaphore threshold value in described reference signal amount not for behavior first, trigger the testing power supply that described processing unit 213 closes described LCD screen 22.
In the present embodiment, LCD screen test overcurrent protective device can after determining that reference signal amount is greater than semaphore threshold value first; again reference signal amount is obtained after ticket reserving time; and itself and semaphore threshold value are compared; if the reference signal amount again obtained still is greater than semaphore threshold value; then close the testing power supply of LCD, avoid interference the erroneous judgement caused of electric wave.When to LCD screen available protecting, prevent the interference of clutter from causing erroneous judgement.
In sum; the present invention is amplified by signal LCD screen sent; if the reference signal amount obtained after amplifying is greater than semaphore threshold value; then trigger the testing power supply that main control end closes described LCD screen, realize the protection to LCD screen, the integrated circuit avoiding power supply and signal wire short circuit to cause burns; and avoid the damage of LCD screen in test process; reduce test loss, this method of testing is simple, and cost is low.In addition, after determining that reference signal amount is greater than semaphore threshold value first, again reference signal amount is obtained after ticket reserving time, and itself and semaphore threshold value are compared, if the reference signal amount again obtained still is greater than semaphore threshold value, then close the testing power supply of LCD, avoid interference the erroneous judgement caused of electric wave.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (8)
1. a LCD screen test over-current protection method, it is characterized in that, described LCD screen is connected with main control end, and described main control end is used for providing signal source and testing power supply to described LCD screen in LCD screen test process; Described LCD screen test over-current protection method comprises the following steps:
Obtain the initialize signal that described LCD screen sends;
Described initialize signal is amplified and subscribes multiple, to obtain reference signal amount;
Judge whether described reference signal amount is greater than semaphore threshold value;
If so, the testing power supply that described main control end closes described LCD screen is then triggered.
2. LCD screen test over-current protection method according to claim 1; it is characterized in that; after determining that described reference signal amount is greater than semaphore threshold value, and trigger before described main control end closes the testing power supply of described LCD screen, described LCD screen test over-current protection method also comprises:
Whether determine that described reference signal amount is greater than semaphore threshold value is behavior first;
If so, then after the ticket reserving time, again obtain reference signal amount, and again judge whether described reference signal amount is greater than semaphore threshold value; If not, then the testing power supply that described main control end closes described LCD screen is triggered.
3. a LCD screen test overcurrent protective device, described LCD screen is connected with main control end, and described main control end is used for providing signal source and testing power supply to described LCD screen in LCD screen test process; It is characterized in that, described LCD screen test overcurrent protective device comprises:
Amplifying circuit, is connected with described LCD screen and described main control end respectively, for obtaining the initialize signal that described LCD screen sends, and described initialize signal is amplified reservation multiple, to obtain reference signal amount;
Described main control end also for judging whether described reference signal amount is greater than semaphore threshold value, and when described reference signal amount is greater than semaphore threshold value, closes the testing power supply of described LCD screen.
4. LCD screen test overcurrent protective device according to claim 3, it is characterized in that, described main control end is connected with described amplifying circuit by GPIO port; When described reference signal amount is greater than semaphore threshold value, the level state of described GPIO port changes, to trigger the testing power supply that described main control end closes described LCD screen.
5. the LCD screen test overcurrent protective device according to claim 3 or 4, it is characterized in that, described main control end comprises:
Supply unit, is connected with described LCD screen, for providing signal source and testing power supply to described LCD screen;
First judging unit, is connected with described amplifying circuit, for judging whether described reference signal amount is greater than semaphore threshold value;
Processing unit, is connected with described first judging unit and supply unit, for when described reference signal amount is greater than semaphore threshold value, closes the testing power supply of described LCD screen.
6. LCD screen test overcurrent protective device according to claim 5, it is characterized in that, described main control end also comprises:
Whether the second judging unit, is connected with described first judging unit and described processing unit, be behavior first for determining that described reference signal amount is greater than semaphore threshold value; And during for being greater than semaphore threshold value in described reference signal amount for behavior first, triggering described first judging unit after the ticket reserving time, again obtaining reference signal amount, and again judging whether described reference signal amount is greater than semaphore threshold value; And during for being greater than semaphore threshold value in described reference signal amount not for behavior first, trigger the testing power supply that described processing unit closes described LCD screen.
7. LCD screen test overcurrent protective device according to claim 3, it is characterized in that, described amplifying circuit is CA3140 operational amplifier.
8. LCD screen test overcurrent protective device according to claim 3, it is characterized in that, described LCD screen and main control end are by MIPI connection.
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| CN201510688750.7A CN105203888A (en) | 2015-10-21 | 2015-10-21 | Overcurrent protection method and device for LCD (liquid crystal display) screen in test |
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| CN201510688750.7A CN105203888A (en) | 2015-10-21 | 2015-10-21 | Overcurrent protection method and device for LCD (liquid crystal display) screen in test |
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Application publication date: 20151230 |