TW201231989A - Detection circuit for detecting pins of visual interface and detecting system for the same - Google Patents

Abstract

The invention discloses a detection circuit for detecting pins of visual interface and detecting system for the same. The detection circuit comprises a first anomaly warning module. The first anomaly warning module has two first light emitting diodes and two first current-limiting resistors. The first light emitting diodes are connected at a first common node. And then the first light emitting diodes are separately connected with the first current-limiting resistors. The first current-limiting resistors are separately connected with a first positive contact and a first negative contact.

Description

201231989 VI. Description of the Invention: [Technical Field] The present invention relates to a detection circuit and a detection system thereof, and more particularly to a detection circuit for detecting an abnormality of a display interface and a detection system thereof. [Prior Art] Most video products on the market, including TV, screen or computer, have been configured with TMDS (Transition Minimized Differciitid).

Signalling) technology to achieve high definition media interface (HDMI) or digital visual interface (DVI) for video and audio transmission. TM Because TMDS technology is used for differential transmission, HDMI And DY [interface can be more anti-interference ability, effective suppression of electromagnetic interference (EMI) and accurate timing positioning than the interface of a single signal transmission wheel. In addition, or the DVI interface, even if there is a differential signal air-welding in the production of the parts, the road can still be signaled due to the ability of the demodulation IC. However, the face of the HDMI interface is widely used by you =__signal empty axis: === high maintenance costs. In this way, regardless of the cost or the customer's perception, it will be a serious loss. The differential interface of the display interface on the circuit board has become an urgent issue in the technical field. Therefore, how to develop a detection circuit and a detection system for detecting abnormalities in the soldering of the feet is described. SUMMARY OF THE INVENTION 201231989 In view of the present invention, the present invention provides a detection circuit and detection (10) for differentially detecting the ride on the display panel of the circuit board to reduce the production cost of the positive body and maintain good performance. Signal quality. According to a specific embodiment, the detection circuit for detecting an abnormality of the display interface of the display interface on the circuit board is detected. The detection circuit includes a first abnormality, and the module does not have a second light-emitting diode and a second current limiting resistor. The two f-lighting two-pole system is electrically connected to a first common contact, and then respectively

The two first current limiting resistors are connected in series and connected to the -first positive terminal. The detection circuit of the present invention includes a second abnormality warning module having two second light emitting diodes and two second current limiting resistors. The two second light emitting electrodes are electrically connected to each other. After the second common hidden point, the second current limiting resistor is connected in series and connected to the second positive contact and the second negative contact.

In addition, the detection circuit of the present invention includes a third abnormality warning module having two third light emitting diodes and two third current limiting resistors, and the two third and second pole systems are electrically connected to each other. After the common contact, the voltage limiting resistor is further divided and connected to a third positive contact and a third negative contact. Furthermore, the detection circuit of the present invention includes a fourth abnormal warning mode, the complex has two fourth light emitting diodes and two fourth current limiting resistors, and the two fourth light emitting devices are electrically connected to each other. After the four-system contacts, the second and fourth current limiting resistors are connected in series and connected to the fourth positive contact and the fourth negative contact. Compared with the prior art, the overall structure of the detection circuit of the present invention is simple, and is directly combined with HDMI or DVI, and the overall cost of the squatter is low, and the invention of good signal quality is maintained. Another aspect of the present invention is to provide a detection system for detecting differential on the display of the display on the circuit board, [ s ] 5 201231989 interface, which is used to reduce the overall production cost and maintain a good signal. quality. According to a specific embodiment, the detection system includes a display interface and a detection circuit. The display interface is soldered to the circuit board, and the display interface has a set of first differential butt pins, the first differential butt pins having a first positive pin, a first negative pin and a first ground connection The foot ^ detection circuit is equipped with a warning module 'the first - abnormal warning mode _ has # 二第 - illuminating two poles two first current limiting resistors' the two first two-pole system is electrically connected to a first After the common contact, the two first-limit currents are connected in series and connected to a first positive contact and a positive contact. The positive contact is electrically connected to the first pin. The first negative connection The point is electrically connected to the first negative pin, and the common contact is electrically connected to the first ground pin. Wherein the second positive pin, the first negative pin and the first ground pin are short-circuited to each other when the second positive pin is connected to the first positive electrode contact and the first negative electrode contact Once the light diodes are extinguished at the same time or separately. Furthermore, the display interface of the flaw detection system has a foot, and the second differential butt joint has a second positive pin 2 = a foot and a second ground connection. The light-emitting diode and the second current-limiting resistor are different: the light-pole system is electrically connected to a second common contact, and then the phase is -m, and is connected to the second forward-turning point and the second The positive pole contact is electrically connected to the second positive pole; wherein: the second grounding pin; wherein the second=connected; = 6 201231989 or respectively annihilated. The display interface of the detection system has a set of a third differential butt joint, the third differential butt foot has a third positive pin, a third leg, and a third ground pin; the detection The circuit system further has a third abnormal disk H having two third light emitting diodes and two third limits

The second f-th current resistor is connected to the third positive contact and the third third. . . , the second positive contact is electrically connected to the third positive pin, and is connected to the third connection. Break it, when the connection ==== pole pin and rhyme two grounding to check the short circuit or the third positive contact and the third negative contact or respectively extinguish. In addition, the display interface of the inspection system has a set of fourth m movable butt joints having a fourth positive pin and a fourth negative: two of which have two fourth light emitting diodes And the second fourth current limiting resistor, == the ί; pole = the same electrical connection to a fourth common contact, and then respectively connected to the point ^ (10) resistor and connected to a fourth positive contact and - fourth negative The positive contact is electrically connected to the fourth positive pin, the fourth negative connection is to the fourth negative pin, the fourth common contact is an electrical pole and the The fourth grounding takes over the short circuit or the minute = the first or the second is extinguished.员铺,,································································································ For or (d). Compared with the prior art, the detection system for detecting the abnormality of the display interface on the circuit board of the present invention can be matched with the video signal graphic generator (Nana P_ngene_), and the test is performed. In terms of time, the production cost of the body is relatively good, but the invention has the effect of maintaining good signal ασ quality. The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

[Embodiment] Please refer to Figure - and Figure 2. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a display interface on a substrate board in accordance with one embodiment of the present invention. Figure 2 - According to the present invention - the specific implementation of the HDMI interface - the sink end of the simple silk structure shown in Figure -, the display interface of this embodiment (four) (four) Congjia: month 'but the failure of the meaning is not repeated here . In addition, the present invention detects MI " problems encountered in the production of the first section 'for example, tmds empty welding short circuit, through Figure 2 can understand HDMI s ancestor (four) architecture, its t differential signal (positive or negative pin) The last job-terminal resistance 仏, and pulled to the internal bias to use this feature for detection. The above-mentioned hdmi's 8 job structure is not different from the prior art and will not be repeated here. Referring to FIG. 3, FIG. 3 is a circuit diagram of the detection system 1 according to an embodiment of the present invention. As shown in FIG. 3, the present invention provides a detection method for detecting an abnormality of a differential position on a display surface A on a circuit board B, which includes a display interface A on the circuit board B and detection. Circuit c. The display interface A is soldered to the circuit board B (not shown), and the display interface A has a group-differential docking pin, a group second differential docking pin, a group third difference [] 8 201231989 ί The butt foot, and the fourth set of the riding pin. The first-differential butt joint is a Xiagu-positive pin A1, a first negative pin Α2, and a first-A3' second differential butt-joining leg has a second positive pin Α4, and a fourth foot The difference between the foot and the foot has a fineness;

All and - fine grounding pins. For example, the negative pin detection circuit C has a first abnormal warning module ci,

Warning module C2, - third abnormal warning module C3, C4. In addition, the detecting circuit C has a first positive turn; == a common contact Ν3, a second positive contact Ν4, - Ν10-f, Ν5, - a second common contact Ν6, - a third positive contact Ν7, the second negative contact Ν8, the third common contact Ν9, the fourth positive contact 〇, the fourth negative contact 、, and the fourth common contact Νΐ2 are respectively connected to the display interface Α Electrical connection. >, "Λ The first abnormality warning module C1 has two first-light-emitting diodes CL11, CL12 and two _ current limiting resistors CRU, CR12, and the two first light-emitting diodes CL 11, CL 12 After being electrically connected to the first common contact N3, the two first current limiting resistors CR11 and CR12 are respectively connected in series and connected to the first positive electrode contact and the first negative electrode contact N2. In the present embodiment, the first positive pole contact N1 is electrically connected to the first positive pole A. The first negative contact NS is electrically connected to the first negative pole A2. The contact N3 is electrically connected to the first ground pin A3. The second abnormality warning module C2 has two second light-emitting diodes CL21, CL22 and two second current limiting resistors CR21 and CR22. The two second light-emitting diodes CL21 and CL22 are electrically connected to the second common After the contact N6, the second second current limiting resistor CR21, CR22 is connected in series to the second positive contact N4 and the second negative contact N5. In this embodiment, the second positive contact N4 is electrically connected to the second positive pin A4, and the second negative contact milk is electrically connected to the second negative pin A5, the second The common contact N6 is connected to the second grounding pin A6. The third abnormality warning module C3 has two third light-emitting two CL31, CL32 and two third current limiting resistors CR31, CR32, and the two third diodes CL31 and CL32 are electrically connected to the third common contact N. The two third current limiting resistors CR31 and CR32 are connected in series to the third positive electrode two=7 and the third negative electrode contact N8, and the third positive electrode contact N7 is connected to the device to implement the injection. The bungee contact (10) is electrically connected to the third negative contact A8, and the third common contact N9 is connected to the third ground pin A9. , C4 1, CL42 and a fourth current limiting resistor CR41, CR42, the second, CL41, CL42 are electrically connected to the fourth common contact Ni2 ▲, and the second/pole is connected in series with the two fine current limiting resistor CR41 , CR42 and the connection point _ and the fourth negative contact point N11. In the embodiment, the ==, the point is electrically connected to the fourth positive pin ai= is electrically connected to the fourth negative pin AU, and the 12 is electrically connected to the fourth grounding pin. A12. Please refer to FIG. 4, which shows a schematic diagram of a display interface on a circuit board according to the present invention. As shown in Figure 4, the second connection is connected to the first: ==U1 will be extinguished. Therefore, the PT is immediately applied by the _ 丨 丨 PT and the positive pin A1 is in an abnormal state. In this concrete case [s 201231989, the other t-displays of interface A are the same, so they are not described here.

Referring to Figure 5, there is shown a schematic diagram of a short circuit in accordance with the present invention, which is shown on the circuit board. As shown in FIG. 5, in the embodiment, when the first positive pin A1 and the first ground pin 8.3 are short-circuited, the first-light-emitting diode CLn connected to the first-positive contact N1 will By annihilation, the detection circuit of the present invention can immediately know the abnormal condition of the first positive pole A1 or the third ground. In this specific implementation, the other pin detection principles of interface a are also the same, so I will not repeat them here. Compared with the prior art, the detection welding of the display interface on the circuit board is abnormal for the abnormal position of the foot _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The overall production cost, the invention effect of maintaining good signal quality. BRIEF DESCRIPTION OF THE DRAWINGS The soldering of the embodiment is shown on the circuit board. Fig. 3 is a schematic diagram of a concrete display interface according to the present invention, which is based on the circuit of the present invention. VIII. The short-circuit soldering of the specific embodiment to the circuit board [Description of main components] A: interface 1: detection system 201231989

CL11, CL12: first light-emitting diode CR11, CR12: CL21, CL22: second light-emitting diode CR21, CR22: CL31, CL32: third light-emitting diode CR31, CR32: CL41, CL42: fourth light-emitting two Polar body CR41, CR42 : B : Circuit board A1 : First positive pin A3 : First ground pin A5 : Second negative pin A7 : Third positive pin A9 : Third ground pin All : Fourth negative Pin C1: first abnormal warning module C3: third abnormal warning module N1: first positive contact N3: first common contact N5: second negative contact N7: third positive contact N9: third Common contact Nil: fourth negative contact

Rt: terminating resistor C: detecting circuit A2: first negative pin A4: second positive pin A6: second grounding pin A8: third negative pin A10: fourth positive pin A12: fourth grounding pin C2: second abnormal warning module C4: fourth abnormal warning module N2: first negative contact N4: second positive contact N6: second common contact N8: third negative contact N10: fourth positive connection Point N12: fourth common contact first current limiting resistor second current limiting resistor third current limiting resistor fourth current limiting resistor AVcc: internal bias 12

Claims (1)

201231989 VII. The scope of application for patents: 1. The detection system of the difference between the display interface on the unified circuit board and the display of the abnormality of the foot-display. 'The scale is on the circuit board, and the display interface has a set of first-differential butt joints. '鄕—Poor riding pin has - first positive pole, mesh = 々,: first negative pole and a first grounding pin, and electric cymbal has - first - financial warning, the first abnormality θ is non-nuclear, and has two first-light-emitting diodes and two first current-limiting electro-optic dipoles. The fourth phase is connected to the first first current-limiting resistor and connected to a first positive contact is electrically connected to the first negative contact, the first positive contact is a positive pin, and the first negative contact is electrically connected to the second ground When the connection pin is connected, the first negative pin and the first ground and the first ground are respectively opened, the two first LEDs connected to the first positive contact are simultaneously or have t 2 The detection system according to the item +1, wherein the display interface further has a first-in-one 接地-one-grounding pin, the detecting power The system is more Li and smart: its f; there are two second light-emitting diodes and 4: the two second current limiting resistors are connected in series and connected to the 料= material-positive contact and the second negative contact Second paragraph = 13 201231989 The light diodes are extinguished simultaneously or separately. 3. The detection system of item 2, wherein the display of the first one and the f-moving butt joint, the third differential docking chat, having - the :t: ί7: pole pin and - a third grounding pin; the detecting circuit & more, the resistor, the two third light emitting diode systems are electrically connected to the contact point, and then the two third current limiting resistors are respectively connected in series and ^ ϋ = Ζ - a third negative contact, the third positive contact is electrically connected to the pole J, and the third negative contact is electrically connected to the third negative: 2 foot pot third negative pin and the third ground connection The short-light dipoles of each other will be destroyed at the same time. The detection system of the third aspect, wherein the display interface is more and f,, and the fourth difference adapter foot, the fourth differential docking foot is called :, L ir alarm module "the system has two fourth light-emitting diodes and a fourth == resistance = two fourth light-emitting diode system common electrical current limiting resistor and connected to - the first pole: pole The fourth positive contact of the pin U is electrically connected to the fourth positive contact f to be electrically connected to the fourth ground pin; wherein, when the third path is connected: the ΪΓi pole and the first The four grounding pins are shortly open to each other. The fourth lion point is 5·r, and the age of the interface is high. The detection system described in the first application of the patent item 1, wherein the display interface is a number [S] 201231989 Video interface. The road type display interface differentially detects the abnormality of the foot. The first-abnormal warning group has two first-light-emitting diodes and two first-current resistors. The two-light-emitting diode system has common electrical properties. After being connected to the common contact, the two first current limiting resistors are connected in series and connected to the -first positive contact and the -first negative contact. 8. If the application for patents turns over the circuit of the seventh description, it also includes: a second abnormality warning module, which has two second light-emitting diodes and two second current limiting resistors. The two second light-emitting diodes are electrically connected to the second common contact, and then connected in series The two second current limiting resistors are connected to the second positive contact and the second negative contact. 9. The detection circuit according to item 8 of the patent application scope further includes: - a third abnormal warning 敎 'the system has two third light emitting diodes and two second = current resistances' After the pole system is electrically connected to the common junction of the two brothers, the two third current limiting resistors are connected in series and connected to the third positive pole contact and the third negative pole contact. 10. The detection circuit according to claim 9 of the patent application scope, further comprising: - a fourth different hoisting alarm module, having two second light emitting diodes and two fourth=current resistances, the second After the fourth light-emitting diode system is electrically connected to the common contact of the four brothers, the two fourth current limiting resistors are connected in series and connected to a fourth positive contact and a fourth negative contact. [ si 15