CN203673803U - Signal source switching circuit for liquid crystal module testing, and liquid crystal module test tool - Google Patents
Signal source switching circuit for liquid crystal module testing, and liquid crystal module test tool Download PDFInfo
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- CN203673803U CN203673803U CN201420030353.1U CN201420030353U CN203673803U CN 203673803 U CN203673803 U CN 203673803U CN 201420030353 U CN201420030353 U CN 201420030353U CN 203673803 U CN203673803 U CN 203673803U
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Abstract
The utility model discloses a signal source switching circuit for liquid crystal module testing, and a liquid crystal module test tool. The signal source switching circuit comprises a multipath input interface circuit, a signal source switching control circuit respectively in electrical connection with each input interface circuit, and an output interface circuit in electrical connection with the signal source switching control circuit. The signal source switching control circuit receives different control signals, and according to the control signals, transmits signals input by the different input interface circuits to the output interface circuit. The signal source switching circuit for the liquid crystal module testing can perform automatic switching of multiple signal source output signals and reduces plugging number of a signal source interface. When the signal source switching circuit for the liquid crystal module testing is applied to the liquid crystal module test tool, the test efficiency can be improved, and the rest cost is reduced.
Description
Technical field
The utility model belongs to product test technical field, specifically, relates to liquid crystal module device for testing, more particularly, relates to liquid crystal module test signal source commutation circuit and has the liquid crystal module test fixture of this circuit.
Background technology
Liquid crystal module, as the primary clustering of liquid crystal display, need to be done various performance tests on production line body, reaches test request and just allows afterwards to use.When liquid crystal module is done performance test, often need to produce corresponding driving signal by multiple different signal sources, to test multiple different parameters indexs of module.At present, when each module manufacturer tests on production line body, conventionally adopt the mode of manually plug between unlike signal source, to do to switch.Such method of testing exists shortcoming below:
First, plug increases line body man-hour and human cost back and forth, has reduced testing efficiency;
Secondly, well-known, anything all has serviceable life, all signal source is plugged to operation if each signal switches, and is easy to damage the output interface of signal source, shortens its serviceable life, and then has increased the cost of line body test fixture.
Summary of the invention
One of the purpose of this utility model is to provide a kind of liquid crystal module test signal source commutation circuit, realizes the automatic switchover to multiple signal source output signals, reduces the plug number of times of signal source.
For realizing above-mentioned technical purpose, the signal source commutation circuit that the utility model provides is achieved by the following technical solutions:
A kind of liquid crystal module test signal source commutation circuit, the signal source control switching circuit that comprises multichannel input interface circuit, be electrically connected respectively with each described input interface circuit, the output interface circuit being electrically connected with described signal source control switching circuit, described signal source control switching circuit receives different control signals, according to control signal, the signal of different input interface circuit inputs is transferred to described output interface circuit.
Signal source commutation circuit as above, described signal source commutation circuit also comprises module electrifying control circuit, described module electrifying control circuit includes gating element, described gating element receives the power supply signal from unlike signal source by input interface circuit described in multichannel, and export the power supply signal of the corresponding signal source of signal of described output interface circuit output according to the gating signal receiving, utilize a signal source that the object of power supply signal and detection signal is provided simultaneously to realize, guarantee the consistance in signal source, simplify externally fed circuit structure, improve resource utilization.
Signal source commutation circuit as above, for guaranteeing the timing synchronization of detection signal and power supply signal, described module electrifying control circuit also include receive different control signals, according to control signal export different gating signals extremely described gating element to control the delay control circuit of described gating element time delay gating.
Signal source commutation circuit as above, in the time that described input interface circuit is two, described gating element is preferably relay, the coil of described relay is connected to according to described gating signal and provides in the input circuit of different input voltages, and the normally opened contact of described relay and normally closed contact receive the power supply signal from signal source by a described input interface circuit respectively.
Preferably, described delay control circuit comprises a NPN triode, the base stage of described NPN triode connects the control signal terminal of described module electrifying control circuit for reception control signal by current-limiting resistance, between described control signal terminal and described current-limiting resistance, be also connected with ground connection charging capacitor, the grounded emitter of described NPN triode; Described input circuit comprises interconnective power input and divider resistance, and the other end of described divider resistance is connected with the collector of described NPN triode, and the coil of described relay and described divider resistance are connected in parallel.
Signal source commutation circuit as above, for guaranteeing the consistance of control signal, the control signal that described module electrifying control circuit receives is preferably the control signal that described signal source control switching circuit receives.
Signal source commutation circuit as above, described signal source commutation circuit is also included as described signal source control switching circuit and described module electrifying control circuit provides the feed circuit of operating voltage.
Concrete, described feed circuit include the voltage conversion circuit that receives external power source signal, this power supply signal is converted to described signal source control switching circuit and the required operating voltage of described module electrifying control circuit.
Signal source commutation circuit as above, described external power source signal can be through the input of described input interface circuit, from the power supply signal of signal source, also can carry out the power supply signal of self-retaining power supply.
Two of the purpose of this utility model is to provide a kind of liquid crystal module test fixture that includes liquid crystal module test signal source commutation circuit described above, to improve testing efficiency, reduces testing cost.
Compared with prior art, advantage of the present utility model and good effect are: the utility model includes multichannel input interface circuit by setting, the signal source commutation circuit of signal source control switching circuit and output interface circuit, can in input interface circuit, access in advance multiple test signal sources, the test signal source that the control signal that only needs change to be input to signal source control switching circuit in test process can select some input interface circuits to connect is automatically current useful signal source, and the signal that this current useful signal source is exported is exported through output interface circuit, as the current required test signal of LCD module under test, realize the automatic switchover of signal source output signal, when integrated this signal source commutation circuit is tested liquid crystal module in test fixture, without relying on and plug manually switching signal source again, reduce signal source plug number of times, thereby improved the testing efficiency of liquid crystal module, extended signal source serviceable life.
Read by reference to the accompanying drawings after embodiment of the present utility model, other features of the present utility model and advantage will become clearer.
Accompanying drawing explanation
Fig. 1 is the theory diagram of an embodiment of the utility model liquid crystal module test signal source commutation circuit;
Fig. 2 is the principle of work block diagram of an embodiment of the utility model liquid crystal module test fixture;
Fig. 3 is the theory diagram of another embodiment of the utility model liquid crystal module test signal source commutation circuit;
Fig. 4 is a physical circuit schematic diagram of module electrifying control circuit in Fig. 3 theory diagram.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Refer to Fig. 1, this figure is depicted as the theory diagram of an embodiment of the utility model liquid crystal module test signal source commutation circuit.
As shown in Figure 1, the signal source commutation circuit of this embodiment includes n road input interface circuit, be respectively input interface circuit 111, input interface circuit 112 ..., input interface circuit 11n, n is natural number; Also include signal source control switching circuit 12 and output interface circuit 13.And n road input interface circuit is electrically connected with signal source control switching circuit 12 respectively, output interface circuit 13 is also electrically connected with signal source switching controls 12.Signal source control switching circuit 12 reception control signal SIG_SWITCH, and according to the different choice of control signal wherein the signal of a road input interface circuit input as current useful signal, and this signal is transferred to output interface circuit 13.
Wherein, each input interface circuit can adopt the socket suitable with the signal output inserting terminal of liquid crystal module test signal source and simple peripheral circuit composition, output interface circuit 13 can adopt with liquid crystal module in suitable socket and the simple peripheral circuit composition of test signal transmission inserting terminal, and signal source control switching circuit 12 can adopt switch chip and simple peripheral circuit composition.And, what consider the output of liquid crystal module test signal source is mostly high speed signal, signal source control switching circuit 12 preferably adopts the switch chip with low conducting electric capacity and low on-resistance, at utmost to reduce return loss and insertion loss, guarantee the integrality of holding signal under higher message transmission rate.
State the principle of work of the signal source commutation circuit of above-described embodiment below in conjunction with the principle of work block diagram of the embodiment of the utility model liquid crystal module test fixture shown in Fig. 2.
The liquid crystal module test of Fig. 1 embodiment is applied by the part that signal source commutation circuit can be used as liquid crystal module test fixture.The signal source commutation circuit of integrated Fig. 1 embodiment in liquid crystal module test fixture, while utilizing this frock test liquid crystal module, LCD module under test 4 plugs with output interface circuit 13, test in n required signal source, each signal source plugs respectively (if signal source quantity is less than input interface circuit quantity, vacant input interface circuit is unsettled) with one of them input interface circuit.Specifically, signal source 31 plugs with input interface circuit 111, and signal source 32 plugs with input interface circuit 112 ..., signal source 3n and input interface circuit 11n plug.Preset the corresponding relation between control signal SIG_SWITCH and signal source, in test process, change as required control signal SIG_SWITCH.Signal source control switching circuit 12 will read control signal SIG_SWITCH, judge according to the corresponding relation between SIG_SWITCH and signal source the signal source that current test need to be used, then control input interface circuit corresponding to this signal source and output interface circuit 13 conductings, thereby the signal of this signal source is transferred to output interface circuit 13, and then transfer to LCD module under test 4, realize the test to module.
Utilize the signal source commutation circuit in test fixture, after required signal source is plugged with input interface circuit in advance, in test process, carry out switching signal source without frequent manually plug again, only need to change control signal, greatly reduce signal source plug number of times, both improve liquid crystal module testing efficiency, also extended signal source serviceable life.And the signal of signal source commutation circuit supported data transfer rate from tens hertz to megahertz more than 2,000 switches, applied widely, highly versatile.
In the time that the switching frock of utilizing above-described embodiment is tested liquid crystal module, LCD module under test 4 can directly be powered by outside fixed power source.But, consider that existing test signal source can provide greatly the output of power supply signal, in order to improve resource utilization, reduce hardware circuit cost, guarantee simplification and the accuracy of operation, the current demand signal source that preferably use is exported test signal for LCD module under test 4 powers to module.For realizing this technical purpose, signal source commutation circuit can adopt the structure of Fig. 3 embodiment to realize.
Refer to Fig. 3, this figure is depicted as the theory diagram of another embodiment of the utility model liquid crystal module test signal source commutation circuit.
As shown in Figure 3, in this embodiment, signal source commutation circuit includes two-way input interface circuit, be respectively input interface circuit 211 and input interface circuit 212, also include signal source control switching circuit 22 and output interface circuit 23, two-way input interface circuit is electrically connected with signal source control switching circuit 22 respectively, and output interface circuit 23 is also electrically connected with signal source control switching circuit 22.The function of input interface circuit 211 and 212, signal source control switching circuit 22 and output interface circuit 23 and specific implementation can be with reference to described in figure 1 embodiment.
In addition, the signal source commutation circuit of this Fig. 3 embodiment also includes module electrifying control circuit 25, in this circuit, include gating element, the power supply signal that this gating element receives respectively from unlike signal source by input interface circuit 211 and 212, and the power supply signal output of the corresponding signal source of signal (being also current useful signal source) that can output interface circuit 23 be exported according to the gating signal receiving.Specifically, be that this power supply signal is exported in LCD module under test.Preferably, also include delay control circuit in module electrifying control circuit 25, this delay control circuit can receive different control signals, and exports different gating signals to gating element according to control signal, to control gating element time delay gating.Like this, can realize because signal source control switching circuit 22 switches in output through multistage element, detection signal output at signal and have and certain delay, control also time delay output of power supply signal, guarantee the timing synchronization of detection signal and power supply signal, improve detection accuracy.Preferred, for guaranteeing the consistance of control signal, for simplifying control procedure, the control signal (being also the control signal of module electrifying control circuit 25) of delay control circuit is same signal with the control signal of signal source control switching circuit 22 simultaneously.Concrete, this control signal includes high level signal and low level signal totally two kinds of different signals.
The specific implementation circuit of the module electrifying control circuit 25 of said structure can be with reference to shown in figure 4 and the description to Fig. 4 below.
In the signal source commutation circuit of this embodiment, signal source control switching circuit 22 and module electrifying control circuit 25 adopt the feed circuit 24 that configure separately in this circuit to power, and to improve the versatility of circuit, simplify externally fed circuit structure.Particularly, in feed circuit 24, include voltage conversion circuit, external power source signal can be converted to signal source control switching circuit 22 and the required operating voltage of module electrifying control circuit 25.Voltage conversion circuit can adopt voltage transitions chip of the prior art and peripheral circuit thereof to realize, and implementation structure and principle can, with reference to prior art, not be specifically addressed at this.And, for the external power source signal being input in voltage conversion circuit, can, through input interface circuit 211 or 212 inputs, from the power supply signal of signal source, also can carry out the power supply signal of self-retaining power supply (as test fixture general supply).For simplifying feed circuit 24 structures, preferably employing can provide fixing power supply stable, consistent supply voltage that this external power source signal is provided.
Refer to Fig. 4, the figure shows a physical circuit schematic diagram of module electrifying control circuit 25 in Fig. 3 embodiment.
Circuit as shown in Figure 4, comprises a NPN triode V1 and relay J 1.Wherein, the base stage of triode V1 is connected with the control signal terminal of whole module electrifying control circuit by current-limiting resistance R2, for reception control signal SIG_SWITCH.Between current-limiting resistance R2 and control signal terminal, be also connected with ground connection charging capacitor C15, the minus earth GND of charging capacitor C15.The grounded emitter GND of triode V1, and its collector from provide the input circuit of different input voltages to be connected for relay J 1.Particularly, the collector of triode V1 is connected with divider resistance R1, and the other end of divider resistance R1 is connected with+5V power input.For relay J 1, its coils from parallel connection of coils is connected to divider resistance R1 two ends, and the normally closed contact 2 of relay J 1 and normally opened contact 4 receive the power supply signal from signal source by an input interface circuit respectively, and by common port 3 one of them power supply signal of output of relay J 1.
In foregoing circuit structure, triode V1 and charging capacitor C1 and current-limiting resistance R2 form delay control circuit, can by divider resistance R1 and+input circuit control that 5V power input forms is as the relay J 1 time delay gating of gating element, and then selects the object of the power supply signal time delay output of the signal source that normal make-and-break contact 2 or normally opened contact 4 are received.In conjunction with Fig. 3, the specific works process of the signal source commutation circuit of this embodiment is summarized as follows:
If SIG_SWITCH is high level signal, signal source control switching circuit 22 is in the time receiving high-level control signal, by input interface circuit 211 and output interface circuit 23 conductings, the signal source being connected with input interface circuit 211 is as current useful signal source, and its output signal is exported through output interface circuit 23.The signal in current useful signal source is switched to when output receiving circuit 23 is exported and has passed through multistage element through signal source control switching circuit 22, and signal output can exist certain time-delay.Meanwhile, the power supply signal in this current useful signal source transfers to normally opened contact 4 places of module electrifying control circuit 25 repeat circuit J1 through input interface circuit 211.
Meanwhile, the SIG_SWITCH signal of high level is input in delay control circuit as the control signal of module electrifying control circuit 25.Due to the existence of charging capacitor C15 in delay control circuit, triode V1 is by conducting after time delay certain hour (delay time is decided by the resistance of current-limiting resistance R2 and the capacitance of charging capacitor C15).Triode V1 conducting, in divider resistance R1, there is electric current to flow through, on the coil of relay J 1, there is pressure reduction, and then generation galvanomagnetic effect, make moving contact and normally opened contact 4 closures, normally opened contact 4 is communicated with common port 3, thereby, the power supply signal in current useful signal source is exported from common port 3, has realized the object of utilizing current useful signal source that power supply signal is provided.And power supply signal is after the 25 time delays outputs of module electrifying control circuit, compared with the detection signal of exporting with output interface circuit 23, output timing is basically identical, has shortened the detection causing because of difference of injection time and has waited for, has improved testing efficiency and test accuracy.
If SIG_SWITCH is low level signal, signal source control switching circuit 22 is in the time receiving low level control signal, by input interface circuit 212 and output interface circuit 23 conductings, the signal source being connected with input interface circuit 212 is as current useful signal source, and its output signal is exported through output interface circuit 23.Same, the signal in current useful signal source is switched to when output receiving circuit 23 is exported and has passed through multistage element through signal source control switching circuit 22, and can there is certain time-delay in signal output.Meanwhile, the power supply signal in this current useful signal source transfers to normally closed contact 2 places of module electrifying control circuit 25 repeat circuit J1 through input interface circuit 212.
Meanwhile, low level SIG_SWITCH signal is input in delay control circuit as the control signal of module electrifying control circuit 25.Due to the existence of charging capacitor C15 in delay control circuit, triode V1 will close after time delay certain hour again.Triode V1 closes, in divider resistance R1, no current flows through, on the coil of relay J 1, there is not pressure reduction, can not produce galvanomagnetic effect, thereby, its moving contact and normally closed contact 2 closures, normally closed contact 2 is communicated with common port 3, thereby the power supply signal in current useful signal source is exported from common port 3, realize the object of utilizing current useful signal source that power supply signal is provided.And power supply signal is after the 25 time delays outputs of module electrifying control circuit, compared with the detection signal of exporting with output interface circuit 23, output timing is basically identical, has shortened the detection causing because of difference of injection time and has waited for, has improved testing efficiency and test accuracy.
The signal source commutation circuit of Fig. 3 embodiment is applied in liquid crystal module test fixture, not only can the realization of automatic switching signal source provide test signal to LCD module under test, can also automatically control and provide the signal source of test signal to provide working power signal for LCD module under test, without the feed circuit that LCD module under test is additionally set again, thereby, make whole module test fixture hardware cost low, the resource taking is few, can meet the demand of line body automatic improving.
Fig. 3 embodiment for be that the signal source commutation circuit with two test signal sources has been done principle explanation, but be not limited to the situation with two signal sources, there are other more signal sources and be also suitable for.Different, if signal source is greater than two, the way that requires signal source control switching circuit 22 to switch is more, and requires module electrifying control circuit 25 can switch more multiple power supplies signal.Accordingly, signal source control switching circuit 22 and the needed control signal SIG_SWITCH of module electrifying control circuit 25 are no longer simple high level, low level both of these cases, and should be able to represent more kinds of different situations.
In addition, in the time that signal source commutation circuit is used in the test of design liquid crystal module, consider that the output signal of signal source is high speed signal, need the choose reasonable pcb board number of plies, guarantee to form independent bus plane and stratum, and wiring layer is positioned on bus plane and stratum.And, the impedance of appropriate design wire distribution distance, live width and wiring, avoiding to greatest extent reflecting, electromagnetic interference (EMI) etc., guarantee the integrality of high speed transmission of signals.
Above embodiment is only in order to the technical solution of the utility model to be described, but not is limited; Although the utility model is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, the technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the utility model technical scheme required for protection.
Claims (10)
1. a liquid crystal module test signal source commutation circuit, it is characterized in that, described signal source commutation circuit comprises multichannel input interface circuit, the signal source control switching circuit being electrically connected respectively with each described input interface circuit, the output interface circuit being electrically connected with described signal source control switching circuit, described signal source control switching circuit receives different control signals, according to control signal, the signal of different input interface circuit inputs is transferred to described output interface circuit.
2. signal source commutation circuit according to claim 1, it is characterized in that, described signal source commutation circuit also comprises module electrifying control circuit, described module electrifying control circuit includes gating element, described gating element receives the power supply signal from unlike signal source by input interface circuit described in multichannel, and exports the power supply signal of the corresponding signal source of signal of described output interface circuit output according to the gating signal receiving.
3. signal source commutation circuit according to claim 2, it is characterized in that, described module electrifying control circuit also include receive different control signal, according to control signal export different gating signals to described gating element to control the delay control circuit of described gating element time delay gating.
4. signal source commutation circuit according to claim 3, it is characterized in that, described input interface circuit is two, described gating element is relay, the coil of described relay is connected to according to described gating signal and provides in the input circuit of different input voltages, and the normally opened contact of described relay and normally closed contact receive the power supply signal from signal source by a described input interface circuit respectively.
5. signal source commutation circuit according to claim 4, it is characterized in that, described delay control circuit comprises a NPN triode, the base stage of described NPN triode connects the control signal terminal of described module electrifying control circuit for reception control signal by current-limiting resistance, between described control signal terminal and described current-limiting resistance, be also connected with ground connection charging capacitor, the grounded emitter of described NPN triode; Described input circuit comprises interconnective power input and divider resistance, and the other end of described divider resistance is connected with the collector of described NPN triode, and the coil of described relay and described divider resistance are connected in parallel.
6. signal source commutation circuit according to claim 5, is characterized in that, the control signal that described module electrifying control circuit receives is the control signal that described signal source control switching circuit receives.
7. according to the signal source commutation circuit described in any one in claim 1 to 6, it is characterized in that, described signal source commutation circuit is also included as described signal source control switching circuit and described module electrifying control circuit provides the feed circuit of operating voltage.
8. signal source commutation circuit according to claim 7, it is characterized in that, described feed circuit include the voltage conversion circuit that receives external power source signal, this power supply signal is converted to described signal source control switching circuit and the required operating voltage of described module electrifying control circuit.
9. signal source commutation circuit according to claim 8, is characterized in that, described external power source signal be through the input of described input interface circuit, from the power supply signal of signal source or carry out the power supply signal of self-retaining power supply.
10. a liquid crystal module test fixture, is characterized in that, described test fixture includes the test of the liquid crystal module described in any one signal source commutation circuit in the claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420030353.1U CN203673803U (en) | 2014-01-17 | 2014-01-17 | Signal source switching circuit for liquid crystal module testing, and liquid crystal module test tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420030353.1U CN203673803U (en) | 2014-01-17 | 2014-01-17 | Signal source switching circuit for liquid crystal module testing, and liquid crystal module test tool |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575345A (en) * | 2015-01-15 | 2015-04-29 | 武汉精测电子技术股份有限公司 | OLED module test system and test method |
| CN107068022A (en) * | 2017-03-08 | 2017-08-18 | 深圳市帝晶光电科技有限公司 | A kind of control circuit of efficient LCM tests |
| CN107515371A (en) * | 2017-09-29 | 2017-12-26 | 武汉华海通用电气有限公司 | A kind of hot-swappable test fixture circuit |
| CN111007672A (en) * | 2019-12-05 | 2020-04-14 | 苏州精濑光电有限公司 | Macroscopic inspection machine for display panel and communication line switching device thereof |
| CN113671294A (en) * | 2021-08-27 | 2021-11-19 | 中航华东光电有限公司 | Testing device for adjusting residual image of liquid crystal module |
-
2014
- 2014-01-17 CN CN201420030353.1U patent/CN203673803U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575345A (en) * | 2015-01-15 | 2015-04-29 | 武汉精测电子技术股份有限公司 | OLED module test system and test method |
| CN104575345B (en) * | 2015-01-15 | 2017-02-01 | 武汉精测电子技术股份有限公司 | OLED module test system and test method |
| CN107068022A (en) * | 2017-03-08 | 2017-08-18 | 深圳市帝晶光电科技有限公司 | A kind of control circuit of efficient LCM tests |
| CN107515371A (en) * | 2017-09-29 | 2017-12-26 | 武汉华海通用电气有限公司 | A kind of hot-swappable test fixture circuit |
| CN111007672A (en) * | 2019-12-05 | 2020-04-14 | 苏州精濑光电有限公司 | Macroscopic inspection machine for display panel and communication line switching device thereof |
| CN113671294A (en) * | 2021-08-27 | 2021-11-19 | 中航华东光电有限公司 | Testing device for adjusting residual image of liquid crystal module |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140625 |
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| CX01 | Expiry of patent term |