CN205506989U - Point screen tool - Google Patents
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- CN205506989U CN205506989U CN201620317706.5U CN201620317706U CN205506989U CN 205506989 U CN205506989 U CN 205506989U CN 201620317706 U CN201620317706 U CN 201620317706U CN 205506989 U CN205506989 U CN 205506989U
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Abstract
The utility model relates to a point screen tool belongs to electronic display ware technical field. This point screen tool includes: first chip, it includes first output and second output, it exports a IO port signal and the 2nd IO port signal respectively, first switch element, it includes first input end, second input, first control end and third output, the second switch unit, it includes third input, fourth input, second control end and fourth output, and the current test chip, it includes the 5th input and the 5th output, wherein, the 5th input is coupled in the first end of power, and first input end and third input are coupled respectively in the 5th output of this current test chip, and second input and fourth input are coupled in the second of this power end, the first control end be coupled in first output in order to receive a IO port signal, the second control end is coupled in the second output in order to receive the 2nd IO port signal.
Description
Technical field
It relates to electronic displays art field, particularly for the some screen tool of test fluid LCD panel.
Background technology
Electronic displays, such as TN (Twisted Nematic, twisted nematic panel), VA (Vertical Alignment, vertical orientation panel), IPS (In-Plane Switching, plane conversion screen) and LTPS LCD (Low Temperature Poly-silicon Liquid Crystal Display, low-temperature polysilicon silicon technology liquid crystal display), it is generally used on electronic equipment such as notebook computer, panel computer, mobile device, TV and other electronic equipments.
Liquid crystal display is to be driven by drive IC (driving chip).Part driving chip is the process for pressing by High Temperature High Pressure, presses to exactly on the correspondence position of glass substrate.Before pressing, have the action of alignment, by chip with mechanism mutually the most corresponding on substrate, aligned after i.e. carry out pressing.But in bonding processes, have machinery or artificial error unavoidably, thus result in the situation of misalignment skew.Therefore, when each pressing, still must artificially observe skew situation.
At COG (chip-on-glass, glass flip chip encapsulates) in technique, current glass substrate and the skew condition detection appraisal procedure of chip pressing, be to utilize microscope direct observing to lay respectively at the relative position between chip with the alignment mark on relative glass substrate.Alignment mark on chip has fixing and relative size and shape between the two with the alignment mark on substrate.
Accordingly, it would be desirable to a kind of new some screen tool.
Being only used for strengthening the understanding of background of this disclosure in information above-mentioned disclosed in described background section, therefore it can include not constituting the information to prior art known to persons of ordinary skill in the art.
Utility model content
The disclosure provides one point screen tool, for the short circuit of automatic detection signal line and open loop state.
Other characteristics of the disclosure and advantage will be apparent from by detailed description below, or partially by the practice of the disclosure and acquistion.
One side according to the disclosure, it is provided that a kind of some screen tool, including one first chip, it includes one first outfan and one second outfan, and it exports one the oneth I/O port signal and one the 2nd I/O port signal respectively；One first switch element, it includes a first input end, one second input, one first control end and one the 3rd outfan；One second switch unit, it includes one the 3rd input, a four-input terminal, one second control end and one the 4th outfan；And a testing current chip, it includes one the 5th input and one the 5th outfan；Wherein, described 5th input is coupled to one first end of a power supply, described first input end and described 3rd input are respectively coupled to described 5th outfan of this testing current chip, described second input and described four-input terminal are coupled to one second end of this power supply, described first controls end is coupled to described first outfan to receive a described I/O port signal, and described second control end is coupled to described second outfan to receive described 2nd I/O port signal.
An embodiment according to the disclosure, wherein this first end output one first voltage signal of this power supply, this second end output one second voltage signal, the level value of described first voltage signal is more than the level value of described second voltage signal.
An embodiment according to the disclosure, also includes: the first output signal line, and its two ends are respectively coupled to the 3rd outfan of described first switch element and one first input interface of a driving chip of a display module；Second output signal line, its two ends are respectively coupled to one second input interface of the 4th outfan of described second switch unit and this driving chip of this display module；Wherein, described driving chip is bound by FPC.
An embodiment according to the disclosure, also includes: one second chip, and it includes one the 6th outfan, its output one enable signal.
An embodiment according to the disclosure, wherein said first chip is fpga chip, and described second chip is ARM chip.
An embodiment according to the disclosure, wherein said first switch element also includes one the 3rd control end, described second switch unit also includes that one the 4th control end, described 3rd control end and the described 4th control end and be respectively coupled to the 6th outfan of described second chip to receive described enable signal.
An embodiment according to the disclosure, wherein said first switch element includes one first analog switch and one second analog switch, wherein said first analog switch, it includes described first input end, described second input, described first control end and one the 7th outfan, and wherein said 7th outfan selects to export described first input end or the voltage signal of described second input according to a described I/O port signal；Described second analog switch, including one the 6th input, one the 7th input, described 3rd control end and described 3rd outfan, wherein said 6th input is coupled to described 7th outfan, described 7th input is coupled to the first outfan of described first chip to receive a described I/O port signal, and described 3rd outfan exports described 6th input or the voltage signal of described 7th input according to described enable signal behavior.
An embodiment according to the disclosure, wherein said second switch unit includes one the 3rd analog switch and one the 4th analog switch, wherein said 3rd analog switch, including described 3rd input, described four-input terminal, described second control end and one the 8th outfan, wherein said 8th outfan selects to export described 3rd input or the voltage signal of described four-input terminal according to described 2nd I/O port signal；Described 4th analog switch, including one the 8th input, one the 9th input, described 4th control end and described 4th outfan, wherein said 8th input is coupled to described 8th outfan, described 9th input is coupled to the second outfan of described first chip to receive described 2nd I/O port signal, and described 4th outfan exports described 8th input or the voltage signal of described 9th input according to described enable signal behavior.
An embodiment according to the disclosure, wherein said screen tool includes the first test mode, wherein when being in described first test mode, the 3rd outfan that a wherein said I/O port signal controls described first switch element exports this first voltage signal, reads the current value of described testing current chip for judging whether open a way between described FPC and described first input interface of described driving chip.
An embodiment according to the disclosure, wherein said screen tool includes the second test mode, wherein when being in described second test mode, the 3rd outfan that a wherein said I/O port signal controls described first switch element exports this first voltage signal, the 4th outfan that described 2nd I/O port signal controls described second switch unit exports this second voltage signal, and the current value reading described testing current chip is the most short-circuit for judging between described first input interface of described driving chip and described second input interface.
An embodiment according to the disclosure, wherein said screen tool includes a screen state, wherein when being in described some screen state, the 4th outfan of the 3rd outfan described I/O port signal of output and described 4th analog switch that wherein said enable signal controls described second analog switch respectively exports described 2nd I/O port signal.
An embodiment according to the disclosure, also includes: alarm unit, and it is coupled to described testing current chip.
An embodiment according to the disclosure, wherein said alarm unit is display lamp.
Point screen tool according to the disclosure, for automatic detection signal line short-circuit conditions, and can judge the connection state between FPC and the junction point of electronic component.
It should be appreciated that it is only exemplary and explanatory that above general description and details hereinafter describe, the disclosure can not be limited.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meets embodiment of the present utility model, and is used for explaining principle of the present utility model together with description.
Fig. 1 schematically shows the circuit diagram of the short circuit that test FPC of the prior art binding causes；
Fig. 2 schematically shows the test schematic diagram of the circuit according to Fig. 1；
Fig. 3 schematically shows the circuit diagram of the some screen tool according to disclosure example embodiment；
Fig. 4 schematically shows the circuit diagram of the some screen tool according to disclosure example embodiment；
Fig. 5 A schematically shows the open test schematic diagram of the some screen tool according to disclosure example embodiment；
Fig. 5 B schematically shows the open test schematic diagram of the some screen tool according to disclosure example embodiment；
Fig. 6 A schematically shows the short-circuit test schematic diagram of the some screen tool according to disclosure example embodiment；
Fig. 6 B schematically shows the short-circuit test schematic diagram of the some screen tool according to disclosure example embodiment.
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing.But, example embodiment can be implemented in a variety of forms, and is not understood as limited to example set forth herein；On the contrary, it is provided that these embodiments make the disclosure will more fully and completely, and the design of example embodiment is conveyed to those skilled in the art all sidedly.Accompanying drawing is only the schematic illustrations of the disclosure, is not necessarily drawn to scale.Reference identical in figure represents same or similar part, thus will omit repetition thereof.
Additionally, described feature, structure or characteristic can be combined in one or more embodiment in any suitable manner.In the following description, it is provided that many details thus provide fully understanding of embodiment of this disclosure.It will be appreciated, however, by one skilled in the art that the technical scheme of the disclosure can be put into practice and omit in described specific detail one or more, or other method, constituent element, device, step etc. can be used.In other cases, known features, method, device, realization, material or operation are not shown in detail or describe makes each side of the disclosure thicken to avoid that a presumptuous guest usurps the role of the host.
Some block diagrams shown in accompanying drawing are functional entitys, it is not necessary to must be corresponding with the most independent entity.Software form can be used to realize these functional entitys, or in one or more hardware modules or integrated circuit, realize these functional entitys, or in heterogeneous networks and/or processor device and/or microcontroller device, realize these functional entitys.
Embodiment described in following exemplary embodiment does not represent all embodiments consistent with this utility model.On the contrary, they only with describe in detail in appended claims, the example of apparatus and method consistent in terms of more of the present utility model.
Generally, following two ways is had to judge holding wire Short (short-circuit) situation that FPC (Flexible Printed Circuit board, flexible print wiring board) Bonding (binding) causes:
(1) microscopy under the microscope；
But, complicated with microscope test operation, efficiency is the lowest, wastes man-hour, is unfavorable for that product 100% detects.
(2) Panel (display floater or display module) upper reserved one group of FPC Bonding resistance test Pin (pin), by measuring the Resistance Analysis holding wire short-circuit conditions of 2.
Wherein, FPC is with PCB (Printed Circuit Board, printed circuit board or the printed substrate) adapter that flexible material i.e. can fold, the material that bends is made, for the connection of LCD display to drive circuit PCB.
Such as, as depicted in figs. 1 and 2, described testing circuit includes showing module 110, driving chip (driver IC) 120 and FPC130, wherein FPC130 and driving chip 120 are by ACF (Anisotropic Conductive Film, anisotropic conducting membrance) gold goal bonding (binding), binding test PAD (metal gasket) 140 is preset at FPC130, judge by measuring the impedance of PAD, test system access is tested PAD to binding, and measure the voltage at this PAD, MCU (Microcontroller Unit, micro-control unit) according to the monitoring range preset, automatically the short circuit that FPC bonding causes is intercepted.In fig. 2, the equivalent resistance assuming FPC is R2, display module meets a power supply VCC, the sheet resistance of driving chip 120 is equivalent to R1, binding test PAD is accessed ADC (the Analog-to-Digital Converter of MCU, analog/digital converter), testing result is fed back to LCD by MCU, it is achieved automatic decision.
There are the following problems for the method:
(1), in the case of can not detecting and binding non-off normal, ACF gold goal ruptures the pin short circuit caused；
(2) short pin position can not be positioned.
And holding wire Open (open circuit) detection, can only judge whether FPC with Connector (junction point) connects by human subjective at present；Or check holding wire Open situation by microscopy, it is impossible to automatically detect.
Fig. 3 schematically shows the circuit diagram of the some screen tool according to disclosure example embodiment.
As it is shown on figure 3, this some screen tool includes: one first chip 310, it includes one first outfan 311 and one second outfan 312, and it exports one the oneth I/O port signal I/O PORT1 and one the 2nd I/O port signal I/O PORT2 respectively；One first switch element 320, it includes that first input end 321,1 second input 322,1 first controls end 323 and one the 3rd outfan 324；One second switch unit 330, it includes that one the 3rd input 331, four-input terminal 332,1 second controls end 333 and one the 4th outfan 334；And a testing current chip 340, it includes one the 5th input 341 and one the 5th outfan 342；Wherein, described 5th input 341 is coupled to one first end 351 of a power supply 350, described first input end 321 and described 3rd input 331 are respectively coupled to described 5th outfan 342 of this testing current chip 340, described second input 322 and described four-input terminal 332 are coupled to one second end 352 of this power supply 350, described first controls end 323 is coupled to described first outfan 311 to receive a described I/O port signal I/O PORT1, described second controls end 333 is coupled to described second outfan 312 to receive described 2nd I/O port signal I/O PORT2.
In figure 3, although illustrate only two switch elements (the most described first switch element 320 and second switch unit 330), but actually, described screen tool can include any number of switch element, concrete switch element quantity can select according to the input interface being test for display floater, and this is not defined by this utility model.
In exemplary embodiment, wherein this first end 351 of this power supply 350 exports one first voltage signal VH, and this second end 352 exports one second voltage signal VL, the level value of the described first voltage signal VH level value more than described second voltage signal VL.
In the exemplary embodiment, described first voltage signal VH is high level, such as VCCIO+0.65V, and described second voltage signal VL is low level, such as VCCIO.But here, low and high level is all comparatively speaking, it is also possible to take other level value.In another embodiment, described first voltage signal VH can be any level value more than VCCIO+0.65V, and described second voltage signal VL can be any level value less than VCCIO+0.65V, and such as, described second voltage signal VL is earth level 0V.Here concrete level value is that the conduction voltage drop of the level value according to the supply voltage in tested display floater and diode selects, as long as the diode that described high level enables to tested display floater is switched on, described low level enables to the diode of tested display floater and is cut off.This is not construed as limiting by this utility model.
It should be noted that, although described power supply 350 is illustrated as in this some screen tool by the Fig. 1 in this utility model embodiment, and it is a single power supply providing two kinds of varying level values, but actually, described screen tool can not include that power supply, described power supply 350 can be an external power source, it might even be possible to the power supply of varying level value can be provided for two or more, Fig. 1 is only exemplary, this utility model is not defined.
In exemplary embodiment, described screen tool also includes: the first output signal line (not shown), and its two ends are respectively coupled to the 3rd outfan 324 of described first switch element 320 and one first input interface of a driving chip of a display module (not shown)；Second output signal line (not shown), its two ends are respectively coupled to the 4th outfan 334 of described second switch unit 330 and one second input interface of this driving chip of this display module；Wherein, described driving chip passes through FPC bonding.
At exemplary embodiment, one end connecting electronic component such as liquid crystal display of described first output signal line, the other end of described first output signal line connects described screen tool to receive voltage signal.When electronic component is with when when attaching object attaching, para-position is shifted out intended offset amount, and electronic component is short-circuit with the meeting of another electronic component and turns on.
For example, when being pasted on glass substrate by IC (integrated circuit, integrated circuit), electronic component can be integrated circuit (such as, driving chip), and attaching object can be glass substrate.In manufacturing process, glass substrate is formed with metal gasket, with for various signals, energy transmission.On the other hand, the pin of driving chip forms thicker conductive projection.
In another embodiment, being to be pasted on PCB by FPC, this electronic component is flexible PCB, and attaches object and be printed circuit board (PCB).
Additionally, mutually can be attached by ACF between electronic component and attaching object.
In the above-described embodiments, before electronic component with attaching object laminating, anisotropic conducting membrance can be attached on the conformable region of object prior to attaching, then be attached by this anisotropic conducting membrance and electronic component.
In some existing electronic installations, the connection between assembly and main body circuit is to be carried out by conducting film (such as, ACF).ACF is to mix with conducting particles (conductive particle) with dielectric synthetic resin.The diameter of conducting particles is about 3-5 micron, and its middle body is polymer, and is coated with metallic conductor outside, such as gold, silver, nickel, stannum, copper etc..ACF is commonly used for the manufacture of display.
Owing to conductive projection has certain thickness, conducting particles can be extruded between conductive projection and metal gasket.By the metal level of conducting particles outer peripheral face cladding, the conducting particles being extruded just constitutes electric connection between conductive projection and metal gasket.Utilize ACF to carry out chip package, just can complete to bond the action that driving chip couples with circuit simultaneously.
It is said that in general, when carrying out ACF chip package, pressing processing technology para-position precision is to judge by visual detection.Owing to being to perform visual detection by testing staff, it is therefore desirable to more manpower, and easily because the erroneous judgement of testing staff or the deficiency of sampling observation rate so that para-position precision significantly reduces.
Occur bit-errors between driving chip and substrate.Conductive projection contacts conducting with the next of a corresponding time metal gasket, now occurs bit-errors.And in another case, although conductive projection the most directly contacts conducting with the next one of a corresponding time metal gasket, but may form short circuit (short) by the conducting particles of ACF.If when testing staff's missing inspection or erroneous judgement, this product having potential problems then can be supplied to client and cause quality abnormal.
The pressing processing technology that this utility model embodiment disclosed some screen tool is applicable between integrated circuit and substrate or substrate and substrate.
In exemplary embodiment, wherein said screen tool includes the first test mode, wherein when being in described first test mode, the 3rd outfan 324 that a wherein said I/O port signal I/O PORT1 controls described first switch element 320 exports this first voltage signal VH, reads the current value of described testing current chip 340 for judging whether open a way (open) between described FPC and described first input interface of described driving chip.
In exemplary embodiment, wherein said screen tool includes the second test mode, wherein when being in described second test mode, the 3rd outfan 324 that a wherein said I/O port signal I/O PORT1 controls described first switch element 320 exports this first voltage signal VH, the 4th outfan 334 that described 2nd I/O port signal I/O PORT2 controls described second switch unit 330 exports this second voltage signal VL, read the current value of described testing current chip 340 for judging the most short-circuit (short) between described first input interface of described driving chip and described second input interface.
In described screen tool, add Open/Short testing circuit, before starting point screen, first carry out Open/Short detection.Being tested by Open, automatic decision FPC is not connected with the connector of driving chip, thus guides product line operator to reconnect；Tested by Short, the short-circuit conditions between automatic decision holding wire, on the one hand intercept the bad product of liquid crystal display, on the one hand prevent the big electric current that short circuit causes to a damage for screen tool I/O mouth.
Fig. 5 A-5B schematically shows the open test schematic diagram of the some screen tool according to disclosure example embodiment.Wherein, in Fig. 5 A, when described screen tool arbitrarily selects an I/O PORTx (test port) to the voltage of high level such as VCCIO+0.65V.When being connected OK (well) such as the connector between fruit dot screen tool and driving chip, Diode (diode) can turn on, and produces electric current I.Fig. 5 B schematically shows when any one I/O PORTx of some screen tool exports high level such as VCCIO+0.65V, and when the connector between some screen tool and driving chip is connected open, Diode is not turned on, and electric current is 0；By the presence or absence of electric current in described testing current chip 340 measurement circuitry, it is achieved Open detects.
Fig. 6 A-6B schematically shows the short-circuit test schematic diagram of the some screen tool according to disclosure example embodiment.Wherein, in Fig. 6 A, when described screen tool arbitrarily selects a test port (such as, I/O PORT1) to the voltage of high level such as VCCIO+0.65V, and other test port is (such as, I/O PORT2 to I/O PORTn, n is positive integer) to the voltage of low level such as VCCIO, if there is not short in the FPC bonding between described screen tool and driving chip, i.e. connect OK (without short to other I/O PORT), electric current on this circuit is the least, close to for 0.Fig. 6 B schematically shows such as state diagram when short occurs in the FPC bonding tested between port I/O PORT1 and I/O PORT2, as this I/O PORT1 and other I/O PORT Short, form short circuit, then can produce big electric current (I1 in diagram) between I/O PORT1 and I/O PORT2, I/O PORT1 circuit self only can produce a small area analysis (I2 in diagram), the extreme currents wherein caused due to characteristic and the short short circuit of diode self, so I1 can be far longer than I2；By the size of electric current in measurement circuitry or detect with or without, it is achieved Short.
By multiple switch elements of setting in a screen tool (such as, first switch element, second switch unit is until the n-th switch element, the corresponding test port of each switch element), time-sharing multiplex, applies conducting voltage signal to a wherein test port at a certain choosing period of time, and other test port wouldn't turn on, can be by measuring the presence or absence of the electric current on this circuit in the corresponding period, it is judged that whether this circuit connects；Or, by in a certain amount of time, optional two test ports, the most tested port applies conducting voltage, other test port wouldn't turn on, the comparison of the size of the electric current of self on the holding wire corresponding with this tested port by measuring the electric current between these two test ports, can judge whether have short circuit between the two test port, i.e. can not only test whether short circuit, additionally it is possible to orienting is to there occurs short circuit between which two holding wire.
In exemplary embodiment, also including: alarm unit, it is coupled to described testing current chip.
In exemplary embodiment, wherein said alarm unit is display lamp.
In an embodiment, alarm unit can be display lamp, and voltage signal can make testing current chip send light by alarm unit.In another embodiment, alarm unit can be buzzer, and voltage signal can make testing current chip send sound by alarm unit.As it is known by the man skilled in the art, alarm unit also can be other, there is the assembly of warning function.
Fig. 4 schematically shows the circuit diagram of the some screen tool according to disclosure example embodiment.
As shown in Figure 4, this some screen tool 400 is with the difference of the some screen tool in above-described embodiment: also including: one second chip (not shown), it includes one the 6th outfan, its output one enable signal EN.Wherein said first switch element 320 also includes one the 3rd control end 423, described second switch unit 330 also includes that one the 4th control end 443, described 3rd control end 423 and the described 4th control end 443 and be respectively coupled to the 6th outfan of described second chip to receive described enable signal EN.
In exemplary embodiment, wherein said first chip 310 is FPGA (Field-Programmable Gate Array, field programmable gate array) chip, described second chip is ARM (Advanced RISC Machines, advanced reduced instruction set machine) chip.But this utility model is to this and is not construed as limiting.
In exemplary embodiment, wherein said first switch element 320 includes one first analog switch 410 and one second analog switch 420.Wherein said first analog switch 410, it includes described first input end 411, described second input 412, described first control end 413 and one the 7th outfan 414, and wherein said 7th outfan 414 selects to export described first input end 411 or the voltage signal (VH or VL) of described second input 412 according to a described I/O port signal I/O PORT1；Described second analog switch 420, including one the 6th input 421, the 7th input 422, described 3rd control end 423 and described 3rd outfan 424, wherein said 6th input 421 is coupled to described 7th outfan 414, described 7th input 422 is coupled to the first outfan 311 of described first chip 310 to receive a described I/O port signal I/O PORT1, and described 3rd outfan 424 selects to export described 6th input 421 or the voltage signal (VH or I/O PORT1) of described 7th input 422 according to described enable signal EN.
In exemplary embodiment, wherein said second switch unit 330 includes one the 3rd analog switch 430 and one the 4th analog switch 440.Wherein said 3rd analog switch 430, including described 3rd input 431, described four-input terminal 432, described second control end 433 and one the 8th outfan 434, wherein said 8th outfan 434 selects to export described 3rd input 431 or the voltage signal (VH or VL) of described four-input terminal 432 according to described 2nd I/O port signal I/O PORT2；Described 4th analog switch 440, including one the 8th input 441, the 9th input 442, described 4th control end 443 and described 4th outfan 444, wherein said 8th input 441 is coupled to described 8th outfan 434, described 9th input 442 is coupled to the second outfan 312 of described first chip 310 to receive described 2nd I/O port signal I/O PORT2, and described 4th outfan 444 selects to export described 8th input 441 or the voltage signal (VL or I/O PORT1) of described 9th input 442 according to described enable signal EN.
In exemplary embodiment, described first analog switch 410, described second analog switch 420, described 3rd analog switch 430 and described 4th analog switch 440 are all alternative selectores.In another embodiment, described first analog switch 410 and described 3rd analog switch 430 are that described second analog switch 420 and described 4th analog switch 440 are with a chip with a chip (IC).Wherein, described first analog switch the 410, the 3rd analog switch 430 and the sample diversified in specifications of described second analog switch the 420, the 4th analog switch 440, described second analog switch 420 and described 4th analog switch 440 have particular/special requirement to bandwidth, conducting resistance, leakage current etc..
When described screen tool 400 is in Open test mode, such as, when a screen tool 400 connects display module (such as, liquid crystal display) time, I/O PORT1 controls described first analog switch 410 and exports VH (VCCIO+0.65V), described enable signal EN controls described second analog switch 420 and exports VH (VCCIO+0.65V), reads the current value of described testing current chip 340, it may be judged whether Open.
When described screen tool 400 is in Short test mode, such as, when a screen tool 400 connects module, I/O PORT1 described first analog switch 410 of control exports VH (VCCIO+0.65V), EN described second analog switch 420 of control and exports VH (VCCIO+0.65V)；Meanwhile, I/O PORT2 described 3rd analog switch 430 of control exports VL (VCCIO), EN described 4th analog switch 440 of control and exports VL (VCCIO), reads the current value of described testing current chip 340, it may be judged whether Short.
When Open or Short occurs, control display lamp respectively and carry out flicker warning.
After Open/Short is completed, EN controls analog switch output normal some screen signal.
In exemplary embodiment, wherein said screen tool includes a screen state, wherein when being in described some screen state, the 4th outfan of the 3rd outfan described I/O port signal I/O PORT1 of output and described 4th analog switch that wherein said enable signal controls described second analog switch respectively exports described 2nd I/O port signal I/O PORT2.
According to Open/Short Cleaning Principle, a current detecting chip can be accessed on every holding wire, by reading the electric current on every testing current chip, judge Open or Short.But so need many current detecting chips, add a cost for screen tool.Now propose detection scheme as shown in Figure 3 and Figure 4, testing current chip is placed on power output end, by analog switch, time-sharing multiplex, it is achieved current measurement.So in whole Open/Short detects, it is only necessary to a current detecting chip.Although adding a lot of analog switch, but compared with the price of current detecting chip, cheaply a lot, thus reduce a cost for screen tool.
The point screen tool of the disclosure, detects automatically by realizing Open/Short, can improve detection efficiency thus improve the yield that dispatches from the factory；It is prevented from holding wire short circuit and produces big electric current, burn out I/O mouth, protection point screen tool.This utility model is capable of in the case of electronic component (Driver IC or FPC) do not has off normal, due to the detection of short circuit between the pin that other reasons causes, and to judge the connection state between the junction point of electronic component.
Those skilled in the art, after considering description and putting into practice utility model disclosed herein, will readily occur to other embodiment of the present utility model.The application is intended to any modification of the present utility model, purposes or adaptations, and these modification, purposes or adaptations are followed general principle of the present utility model and include the undocumented common knowledge in the art of the disclosure or conventional techniques means.Description and embodiments is considered only as exemplary, and true scope of the present utility model and spirit are pointed out by claim below.
More than it is particularly shown and described the illustrative embodiments of the disclosure.It should be appreciated that the disclosure is not limited to detailed construction described herein, set-up mode or implementation method；On the contrary, the disclosure is intended to contain the various amendments comprised in the spirit and scope of the appended claims and equivalence is arranged.
Claims (13)
1. a some screen tool, it is characterised in that including:
One first chip, it includes one first outfan and one second outfan, and it exports one the oneth I/O port signal and one the 2nd I/O port signal respectively；
One first switch element, it includes a first input end, one second input, one first control end and one the 3rd outfan；
One second switch unit, it includes one the 3rd input, a four-input terminal, one second control end and one the 4th outfan；And
One testing current chip, it includes one the 5th input and one the 5th outfan；Wherein,
Described 5th input is coupled to one first end of a power supply, described first input end and described 3rd input are respectively coupled to described 5th outfan of this testing current chip, described second input and described four-input terminal are coupled to one second end of this power supply, described first controls end is coupled to described first outfan to receive a described I/O port signal, and described second control end is coupled to described second outfan to receive described 2nd I/O port signal.
Screen tool the most according to claim 1, it is characterised in that wherein this first end output one first voltage signal of this power supply, this second end output one second voltage signal, the level value of described first voltage signal is more than the level value of described second voltage signal.
Screen tool the most according to claim 2, it is characterised in that also include:
First output signal line, its two ends are respectively coupled to the 3rd outfan of described first switch element and one first input interface of a driving chip of a display module；
Second output signal line, its two ends are respectively coupled to one second input interface of the 4th outfan of described second switch unit and this driving chip of this display module；
Wherein, described driving chip is bound by FPC.
Screen tool the most according to claim 3, it is characterised in that also including: one second chip, it includes one the 6th outfan, its output one enable signal.
Screen tool the most according to claim 4, it is characterised in that wherein said first chip is fpga chip, and described second chip is ARM chip.
Screen tool the most according to claim 4, it is characterized in that, wherein said first switch element also includes one the 3rd control end, described second switch unit also includes that one the 4th control end, described 3rd control end and the described 4th control end and be respectively coupled to the 6th outfan of described second chip to receive described enable signal.
Screen tool the most according to claim 6, it is characterised in that wherein said first switch element includes one first analog switch and one second analog switch, wherein
Described first analog switch, it includes described first input end, described second input, described first control end and one the 7th outfan, and wherein said 7th outfan selects to export described first input end or the voltage signal of described second input according to a described I/O port signal；
Described second analog switch, including one the 6th input, one the 7th input, described 3rd control end and described 3rd outfan, wherein said 6th input is coupled to described 7th outfan, described 7th input is coupled to the first outfan of described first chip to receive a described I/O port signal, and described 3rd outfan exports described 6th input or the voltage signal of described 7th input according to described enable signal behavior.
Screen tool the most according to claim 7, it is characterised in that wherein said second switch unit includes one the 3rd analog switch and one the 4th analog switch, wherein
Described 3rd analog switch, including described 3rd input, described four-input terminal, described second control end and one the 8th outfan, wherein said 8th outfan selects to export described 3rd input or the voltage signal of described four-input terminal according to described 2nd I/O port signal；
Described 4th analog switch, including one the 8th input, one the 9th input, described 4th control end and described 4th outfan, wherein said 8th input is coupled to described 8th outfan, described 9th input is coupled to the second outfan of described first chip to receive described 2nd I/O port signal, and described 4th outfan exports described 8th input or the voltage signal of described 9th input according to described enable signal behavior.
Screen tool the most according to claim 3, it is characterised in that wherein said some screen tool includes the first test mode, wherein
When being in described first test mode, the 3rd outfan that a wherein said I/O port signal controls described first switch element exports this first voltage signal, reads the current value of described testing current chip for judging whether open a way between described FPC and described first input interface of described driving chip.
Screen tool the most according to claim 3, it is characterised in that wherein said some screen tool includes the second test mode, wherein
When being in described second test mode, the 3rd outfan that a wherein said I/O port signal controls described first switch element exports this first voltage signal, the 4th outfan that described 2nd I/O port signal controls described second switch unit exports this second voltage signal, and the current value reading described testing current chip is the most short-circuit for judging between described first input interface of described driving chip and described second input interface.
11. screen tools according to claim 8, it is characterised in that wherein said some screen tool includes a screen state, wherein
When being in described some screen state, the 4th outfan of the 3rd outfan described I/O port signal of output and described 4th analog switch that wherein said enable signal controls described second analog switch respectively exports described 2nd I/O port signal.
12. screen tools according to claim 1, it is characterised in that also including: alarm unit, it is coupled to described testing current chip.
13. screen tools according to claim 12, it is characterised in that wherein said alarm unit is display lamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620317706.5U CN205506989U (en) | 2016-04-15 | 2016-04-15 | Point screen tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620317706.5U CN205506989U (en) | 2016-04-15 | 2016-04-15 | Point screen tool |
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| CN205506989U true CN205506989U (en) | 2016-08-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669094A (en) * | 2018-12-19 | 2019-04-23 | 上海帆声图像科技有限公司 | The detection device and method of signal wire in a kind of display screen |
| CN111583881A (en) * | 2020-05-18 | 2020-08-25 | 深圳市华星光电半导体显示技术有限公司 | Time sequence control panel |
| CN112285446A (en) * | 2019-07-12 | 2021-01-29 | 瑞昱半导体股份有限公司 | Test system, transmission device and receiving device for executing multiple tests |
-
2016
- 2016-04-15 CN CN201620317706.5U patent/CN205506989U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669094A (en) * | 2018-12-19 | 2019-04-23 | 上海帆声图像科技有限公司 | The detection device and method of signal wire in a kind of display screen |
| CN112285446A (en) * | 2019-07-12 | 2021-01-29 | 瑞昱半导体股份有限公司 | Test system, transmission device and receiving device for executing multiple tests |
| CN111583881A (en) * | 2020-05-18 | 2020-08-25 | 深圳市华星光电半导体显示技术有限公司 | Time sequence control panel |
| CN111583881B (en) * | 2020-05-18 | 2021-09-24 | 深圳市华星光电半导体显示技术有限公司 | Time sequence control panel |
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